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Hi does anyone have any more details to explain for " B and D" ? I thought the usage of "which" is seemed to be correct with comma before, which might indicates the radio rather than the telephone :(

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lindseym When we see a noun modifier indicated by "which" or "that" after a noun, it should refer to the immediately preceding noun. It can't jump over big parts of the sentence to refer to an earlier noun.
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Hi does anyone have any more details to explain for " B and D" ? I thought the usage of "which" is seemed to be correct with comma before, which might indicates the radio rather than the telephone :(

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The problem with (B) and (D) is that the "which" SEEMS to modify "telephone". Can the which technically modify "radio" in those choices? Sure. But, at best, it's unclear whether the "which" modifies "radio" or "telephone".

The correct meaning is much clearer in choice (C). We essentially have, "Marconi conceived of the radio as a tool for conversation; instead, it has become... a tool for communicating with a large, public audience." - "Marconi conceived of the radio as a tool for X; instead, it has become a tool for Y." Given the context, "it" clearly refers to "radio".

Since the meaning is clear in (C) and since it avoids the "which" issues present in (B) and (D), (C) is a better option.

I hope that helps!
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105. Marconi’s conception of the radio was as a substitute for the telephone, a tool for private conversation; instead, it is precisely the opposite, a tool for communicating with a large, public audience.

(B) Marconi conceived of the radio as a substitute for the telephone, a tool for private conversation, but which is
(C) Marconi conceived of the radio as a tool for private conversation that could substitute for the telephone; instead, it has become

CONFUSION BETWEEN ANS CHOICE B & C [Error analysis]

Pronoun - Why in ans choice B - Which [ DC ] cant refer to radio
How ans choice C- It in IC 2 refers back to radio?
Modifier- Also there is modifier placement [ a tool for private conversation ] issue with original choice and answer choice C ? Where the modifier should be placed ?
Tense - Use of present perfect tense in correct answer choice C. Can I not use is as mentioned in the original choice and answer choice B ?

Meaning analysis

1. Marconi had a conception of the radio that it could be used as a substitute for telephone
2. But the use of radio is precisely the opposite
Dear gmat2013s,
I'm happy to help. :-)

Question #1
In (B), "which is ..." begins a modifying clause. There are a few problems here. First of all, a modifying clause generally touches the noun is modifies --- the Modifier Touch Rule, and this clause doesn't touch "radio." See this link for more on the Modifier Touch Rule:
https://magoosh.com/gmat/2013/modifiers- ... orrection/
Second, the GMAT uses "which" exclusively for non-restrictive, non-vital modifiers, so this doesn't fit here. For more on these, see:
https://magoosh.com/gmat/2012/that-vs-which-on-the-gmat/
https://magoosh.com/gmat/2012/gmat-gramm ... modifiers/
Finally, the use of the "which" clause does something funky to the parallelism. It would be perfectly fine to have two "as" prepositions in parallel, a second one in parallel with "as a tool ..." It would also be perfectly fine to have two independent clauses, as (C) has. The structure in (B) though,
conceived of A as B, but which ...
It is certainly not parallel, and because of this, it feels awkward. We know that the "which" should modify "radio", but that's way over in another part of the sentence, so the antecedent of "which" is grammatically unclear. This is a very poor design for the sentence.

Question #2
Unlike a modifier, a pronoun can appear in a distant part of a sentence, not touching the noun to which it refers. That is a HUGE difference between pronouns and modifiers. After the "but", the "which" is very strange, because it's not touching the thing it modifies, but this is no problem for the pronoun "it."
What is the antecedent of the pronoun "it" in (C)? Well, in the first half of the sentence, there are a few singular nouns, but I would really say that "radio" is the star and focus of the first half. If you had to sum up in one word what the topic of the first half of the sentence was, it's absolutely unambiguous that this one word would be "radio." Therefore, when the "it" appears in the second half, it's absolutely unambiguous that it refers to "radio." What justifies this exclusive focus is not anything in the grammar, but the logic and meaning. Folks mistakenly think that GMAT SC is only about grammar. Not true. Logic and meaning are much much more important than grammar.

Question #3
(B) Marconi conceived of the radio as a substitute for the telephone, a tool for private conversation, ...
Think about this. Here, the phrase "a tool for private conversation" modifies "telephone", explaining to us what a telephone is. That's ridiculous! What person over the age of six need any explanation about what a telephone is? This is entirely absurd!!
Also, think: did Marconi say "I want to invent a new substitute"? Or did he say, "I want to invent a new tool"? There's something subtly illogical about Marconi conceiving of his invention primarily as a substitute. That's really a level of subtlety a little beyond what the GMAT would test, but notice that incorrect answers on the GMAT SC, in addition to having something 100% clear and bonafide wrong, also are sprinkled with these subtle logical mistakes.
Now, think about (C)'s phrasing:
(C) Marconi conceived of the radio as a tool for private conversation that could substitute for the telephone...
This is far superior. Now, the phrase "a tool for private conversation" is how Marconi thought of the radio ---- that's surprising and interesting, because it's different from the way we think about the radio! It's placement here is interesting and thought-provoking. By contrast, it's placement in (B) is mind-numbingly uninteresting. Marconi invents a "tool", and this "tool" can also be a "substitute" --- far more logical.

Question #4
The choice of tense is not black & white. A few different options would be completely acceptable. It would be 100% correct in this context to say:
(a) ... instead, it is precisely the opposite, ...
(b) ... instead, it became precisely the opposite, ..
(c) ... instead, it has become precisely the opposite, ..
The GMAT would not consider any of those "wrong" in the sense of something that would make an answer choice incorrect. Of these three, the present perfect, the third option, is the best. The present perfect tense shows an action that began in the past and, in some way, still continues to the present moment. It is perfect for a situation in which an action happened in the past but the influence of the action continues to the present moment --- in that sense, the action is still "with us." It was a while ago, probably in Marconi's own time, that folks figured out that the radio would not work as a private communication device, and it became a tool for large-scale broadcasting. That happened a while ago, but the effect of that revisioning is still with us, insofar as we still listen to radio and use in precisely the same way in the present day. This situation makes the present perfect tense ideal, although, once again, neither of the other two would be "wrong" on the GMAT. Here's a blog on the perfect tenses:
https://magoosh.com/gmat/2012/gmat-verb- ... ct-tenses/

For all these reasons, (B) is highly flawed, and (C) is a wonderfully clear & logical choice.

Does all this make sense?
Mike :-)

Hi Mike,

Nice explanation. one question, Can we have both But and which appear together as in option B, in a correct usage?
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shanks2020

Sure, there's nothing stopping us from using "but" and "which" together. Although answer choice B is certainly a mess, "but" is just a conjunction, so it's quite normal to use it to join a modifier such as "which . . . " to another modifier. For instance, we might say "She voted for the revised bill, which provided a narrower range of benefits but which was less objectionable to the majority of her constituents." One might see the second "which" as unnecessary, but it's not wrong, and in some cases the GMAT will use such repetitions to provide clarity.
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This is another question that’s at the top of my list of the most unsatisfying official GMAT SC questions ever produced.

I’ll be honest: my first instinct is to eliminate the correct answer because of pronoun ambiguity, but that’s a bad idea: pronoun ambiguity is not an absolute rule on the GMAT (more on that in this video), and there are far worse errors in the other answer choices.

And that’s classic GMAT right there: there aren’t a ton of absolute RULES that ALWAYS apply on the GMAT, but it’s always true that you’ll want to eliminate the four worst answer choices. Whatever you’re left with might not be great, but it’ll be correct enough.

Quote:
A. Marconi’s conception of the radio was as a substitute for the telephone, a tool for private conversation; instead, it is
That “it” jumps out at me right away. It just doesn’t seem awesome: “it” could refer to “conversation” or “tool” or “telephone” or “substitute” or “radio” or “conception of the radio.” Actually, since “it” is the subject of the second full clause in the sentence, that pronoun most likely refers to the subject of the first full clause, “Marconi’s conception of the radio.” (Again, more on these pronoun issues in this video.)

Of course, “it” logically needs to refer to “radio.” So we definitely have a pronoun ambiguity situation on our hands, but pronoun ambiguity isn’t an absolute crime. So I wouldn’t eliminate (A) based only on the pronoun issue.

But there’s also a meaning issue with (A): “Marconi’s conception… was as a substitute for the telephone…” Wait, no. Logically, the radio is the substitute for the telephone – the “conception of the radio” definitely is not the substitute.

So I’m not 100% comfortable eliminating (A) based on the pronoun ambiguity alone, but the logical problem at the beginning of the sentence gives us a reason to ditch (A) with confidence.

Quote:
B. Marconi conceived of the radio as a substitute for the telephone, a tool for private conversation, but which is
This is such a confusing mess that it’s hard for me to explain why it’s a confusing mess. The whole problem is “but which is”, a phrase that seems to be (awkwardly) referring to the telephone. But that doesn’t make sense: “the telephone… but which is precisely the opposite, a tool for communicating with a large, public audience.”

Nope. It’s the radio that's the tool for communicating with a large, public audience – not the telephone. If we switched “which” to “it” (or “instead it”), then we might be OK, but (B) in its current form just doesn’t make sense.

Quote:
C. Marconi conceived of the radio as a tool for private conversation that could substitute for the telephone; instead, it has become
Like (A), (C) has some potential pronoun ambiguity: “it” would refer to “the radio” or “private conversation” or “substitute” or “telephone.” But again: pronoun ambiguity is NOT automatically wrong on the GMAT. And in this case, I think you could argue that the “it” isn’t even all that confusing.

And the thing is, I don’t see any other problems. The modifier “that could substitute for the telephone” seems to correctly modify “tool for private conversation.” I’m OK with the verb tense at the end of the underlined portion of the sentence: “[the radio] has become a tool for communicating with a large, public audience.” Sure, I guess we could say that the radio started to become a tool for mass communication long ago, and continues to become a tool for communicating with a large, public audience.

Honestly, I’d be happier picking an answer choice that doesn’t have the pronoun ambiguity problem, but ONLY IF that answer choice doesn’t have more severe problems. (C) at least makes sense, and the pronoun ambiguity isn’t enough to eliminate it. So let’s keep the little booger for now.

Quote:
D. Marconi conceived of the radio to be a tool for private conversation, a substitute for the telephone, which has become
(D) has nice, clear problems. The modifier beginning with “which” is just plain wrong: “which has become a tool for communicating with a large, public audience” seems to modify “the telephone”, and that makes no sense at all.

And for whatever it’s worth, “conceived… to be” is not the correct idiom. It should be “conceived… as.” But don’t lose too much sleep over idioms, since there are around 25,000 of them in English.

Anyway, (D) is out.

Quote:
E. Marconi conceived of the radio to be a substitute for the telephone, a tool for private conversation, other than what it is,
For starters, we have the same idiom problem as in (D). But then there’s just a messy construction later in the sentence: “Marconi conceived of the radio to be a substitute for the telephone…., other than what it is, a tool for communicating with a large, public audience.”

Huh? “Other than what it is”? That’s a mess, and the contrast isn’t clear between Marconi’s conception of the radio and what it actually is: (C) much more clearly states that the radio is instead a tool for mass communication.

So (E) is gone, and we’re left with (C). So pronoun ambiguity isn’t ideal, but it’s not automatically your enemy, either.


Thanks for this great detailed explanation. I had a quick question about the correct answer choice. Doesn't the "that" in C refer back to private conversation instead of referring to tool?
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ag1991

Thanks for this great detailed explanation. I had a quick question about the correct answer choice. Doesn't the "that" in C refer back to private conversation instead of referring to tool?
If you see the option,
Marconi conceived of the radio as a tool for private conversation that could substitute for the telephone; instead, it has become." And replace that with private conversation, its not making any sense, when we are looking forward for a meaning of a word it has to fit with the original context.
Substituting that with private conversation,
Marconi conceived of the radio as a tool for private conversation {private conversation} could substitute for the telephone; instead, it has become. Which is creating redundancy.
That is referred to a tool here which is acting as a substitute for the telephone.

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ag1991

Thanks for this great detailed explanation. I had a quick question about the correct answer choice. Doesn't the "that" in C refer back to private conversation instead of referring to tool?
If you see the option,
Marconi conceived of the radio as a tool for private conversation that could substitute for the telephone; instead, it has become." And replace that with private conversation, its not making any sense, when we are looking forward for a meaning of a word it has to fit with the original context.
Substituting that with private conversation,
Marconi conceived of the radio as a tool for private conversation {private conversation} could substitute for the telephone; instead, it has become. Which is creating redundancy.
That is referred to a tool here which is acting as a substitute for the telephone.

Posted from my mobile device

Exactly if the 'that' refers to private conversation it doesn't make sense which is why I eliminated C. With the given construct, shouldn't 'that' refer to private conversation even though it should refer to tool? Can the experts chime in please? DmitryFarber GMATNinja
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ag1991

Thanks for this great detailed explanation. I had a quick question about the correct answer choice. Doesn't the "that" in C refer back to private conversation instead of referring to tool?
If you see the option,
Marconi conceived of the radio as a tool for private conversation that could substitute for the telephone; instead, it has become." And replace that with private conversation, its not making any sense, when we are looking forward for a meaning of a word it has to fit with the original context.
Substituting that with private conversation,
Marconi conceived of the radio as a tool for private conversation {private conversation} could substitute for the telephone; instead, it has become. Which is creating redundancy.
That is referred to a tool here which is acting as a substitute for the telephone.

Posted from my mobile device

Exactly if the 'that' refers to private conversation it doesn't make sense which is why I eliminated C. With the given construct, shouldn't 'that' refer to private conversation even though it should refer to tool? Can the experts chime in please? DmitryFarber GMATNinja
This is something we touched on briefly in an earlier post -- noun modifiers don't always “touch” the noun being modified (see "Usage #4" in this article for more on that).

Let us know if you still have questions!
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GMATNinja AjiteshArun GMATNinjaTwo

hey experts,

hope you guys are doing well.

Even though I agree that C is the best of the given options, I have a doubt. C says, "as a tool for private conversation that could substitute"... How can the the tool perform the action of substituting ? shouldn't it be "that could be substituted" ??

Looking forward to hearing from you guys

Best Regards,
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INSEADIESE
GMATNinja AjiteshArun GMATNinjaTwo

hey experts,

hope you guys are doing well.

Even though I agree that C is the best of the given options, I have a doubt. C says, "as a tool for private conversation that could substitute"... How can the the tool perform the action of substituting ? shouldn't it be "that could be substituted" ??

Looking forward to hearing from you guys

Best Regards,
Hi INSEADIESE,

Substitute can be used in more than one way. It can mean "use instead of", but it can also mean "be used instead of" ("substitute for sth").

Here are a few examples:
1. We will substitute X for Y. ← "We will replace Y with X" | "We will use X instead of Y"
2. X will substitute for Y. ← "X will replace Y" | "X will perform the same job as Y"
3. We will substitute X with Y. ← "We will replace X with Y" | "We will use Y instead of X"
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This is another question that’s at the top of my list of the most unsatisfying official GMAT SC questions ever produced.

I’ll be honest: my first instinct is to eliminate the correct answer because of pronoun ambiguity, but that’s a bad idea: pronoun ambiguity is not an absolute rule on the GMAT (more on that in this video), and there are far worse errors in the other answer choices.

And that’s classic GMAT right there: there aren’t a ton of absolute RULES that ALWAYS apply on the GMAT, but it’s always true that you’ll want to eliminate the four worst answer choices. Whatever you’re left with might not be great, but it’ll be correct enough.

Quote:
A. Marconi’s conception of the radio was as a substitute for the telephone, a tool for private conversation; instead, it is
That “it” jumps out at me right away. It just doesn’t seem awesome: “it” could refer to “conversation” or “tool” or “telephone” or “substitute” or “radio” or “conception of the radio.” Actually, since “it” is the subject of the second full clause in the sentence, that pronoun most likely refers to the subject of the first full clause, “Marconi’s conception of the radio.” (Again, more on these pronoun issues in this video.)

Of course, “it” logically needs to refer to “radio.” So we definitely have a pronoun ambiguity situation on our hands, but pronoun ambiguity isn’t an absolute crime. So I wouldn’t eliminate (A) based only on the pronoun issue.

But there’s also a meaning issue with (A): “Marconi’s conception… was as a substitute for the telephone…” Wait, no. Logically, the radio is the substitute for the telephone – the “conception of the radio” definitely is not the substitute.

So I’m not 100% comfortable eliminating (A) based on the pronoun ambiguity alone, but the logical problem at the beginning of the sentence gives us a reason to ditch (A) with confidence.

Quote:
B. Marconi conceived of the radio as a substitute for the telephone, a tool for private conversation, but which is
This is such a confusing mess that it’s hard for me to explain why it’s a confusing mess. The whole problem is “but which is”, a phrase that seems to be (awkwardly) referring to the telephone. But that doesn’t make sense: “the telephone… but which is precisely the opposite, a tool for communicating with a large, public audience.”

Nope. It’s the radio that's the tool for communicating with a large, public audience – not the telephone. If we switched “which” to “it” (or “instead it”), then we might be OK, but (B) in its current form just doesn’t make sense.

Quote:
C. Marconi conceived of the radio as a tool for private conversation that could substitute for the telephone; instead, it has become
Like (A), (C) has some potential pronoun ambiguity: “it” would refer to “the radio” or “private conversation” or “substitute” or “telephone.” But again: pronoun ambiguity is NOT automatically wrong on the GMAT. And in this case, I think you could argue that the “it” isn’t even all that confusing.

And the thing is, I don’t see any other problems. The modifier “that could substitute for the telephone” seems to correctly modify “tool for private conversation.” I’m OK with the verb tense at the end of the underlined portion of the sentence: “[the radio] has become a tool for communicating with a large, public audience.” Sure, I guess we could say that the radio started to become a tool for mass communication long ago, and continues to become a tool for communicating with a large, public audience.

Honestly, I’d be happier picking an answer choice that doesn’t have the pronoun ambiguity problem, but ONLY IF that answer choice doesn’t have more severe problems. (C) at least makes sense, and the pronoun ambiguity isn’t enough to eliminate it. So let’s keep the little booger for now.

Quote:
D. Marconi conceived of the radio to be a tool for private conversation, a substitute for the telephone, which has become
(D) has nice, clear problems. The modifier beginning with “which” is just plain wrong: “which has become a tool for communicating with a large, public audience” seems to modify “the telephone”, and that makes no sense at all.

And for whatever it’s worth, “conceived… to be” is not the correct idiom. It should be “conceived… as.” But don’t lose too much sleep over idioms, since there are around 25,000 of them in English.

Anyway, (D) is out.

Quote:
E. Marconi conceived of the radio to be a substitute for the telephone, a tool for private conversation, other than what it is,
For starters, we have the same idiom problem as in (D). But then there’s just a messy construction later in the sentence: “Marconi conceived of the radio to be a substitute for the telephone…., other than what it is, a tool for communicating with a large, public audience.”

Huh? “Other than what it is”? That’s a mess, and the contrast isn’t clear between Marconi’s conception of the radio and what it actually is: (C) much more clearly states that the radio is instead a tool for mass communication.

So (E) is gone, and we’re left with (C). So pronoun ambiguity isn’t ideal, but it’s not automatically your enemy, either.

Here in option B, Substitute for is something which I find weird. shouldn't it be just 'substitute telephone'? could you explain how the use of substitute for is correct?
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Here in option B, Substitute for is something which I find weird. shouldn't it be just 'substitute telephone'? could you explain how the use of substitute for is correct?
Hi AG95,

Substitute for is a fairly common phrase. You could also go through this post.
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GMATNinja How is the second clause independent if it starts with 'instead'? Can a preposition initiate an independent clause?
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adityaganjoo

Instead is an adverb, not a subordinating conjunction. Something like because it has become... would not be an independent clause, but instead, it has become... is an independent clause.
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adityaganjoo

Instead is an adverb, not a subordinating conjunction. Something like because it has become... would not be an independent clause, but instead, it has become... is an independent clause.

AjiteshArun Thanks! But could you provide some more clarity? Even if instead behaves as an adverb, how is the clause independent? Can all the clauses that can behave as complete sentences be considered independent clauses?
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adityaganjoo
AjiteshArun Thanks! But could you provide some more clarity? Even if instead behaves as an adverb, how is the clause independent? Can all the clauses that can behave as complete sentences be considered independent clauses?
Hi adityaganjoo,

That's right. A clause that can stand alone as a complete sentence is an independent clause (we won't see sentences like "No." or "Yes!" on the GMAT).

Subordinate clauses can't be used as complete sentences (because it has become... what happened because of that?). More generally, we expect subordinate (dependent) clauses when we see subordinating conjunctions (hence the name :)) like because. With adverbs like instead, however, we just ignore the adverb if we're trying to figure out what the rest of the structure is.

You can find a more complete list of subordinating conjunctions here.
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