Coronary angiography, a sophisticated method for diagnosing coronary

Question

Coronary angiography, a sophisticated method for diagnosing coronary disease involving the introduction of a dye into the arteries of the heart, is now administered selectively, because it uses x-rays to observe cardiac function.

(A) for diagnosing coronary disease involving the introduction of a dye into the arteries of the heart, is now administered selectively, because it uses

(B) for diagnosing coronary disease involving the introduction of a dye into the arteries of heart, is now administered selectively, because of using

(C) for diagnosing coronary disease, involves the introduction of dye into the arteries of the heart and is now administered selectively, because it uses

(D) to diagnose coronary disease that involves the introduction of a dye into the arteries of the heart, is now administered selectively, because it uses

(E) to diagnose coronary disease involving the introduction of a dye into the arteries of the heart, which is now administered selectively, uses

Show Spoiler

Please explain me why the answer "C" is preferred over "D"?

PS.before posting this Q,I looked at below mentioned url but 227 Q was not there.
https://gmatclub.com/forum/1-1000sc-100- ... 85402.html

santivilla · Accepted Answer

@maybeam

regarding your question
when speaking in manners of procedures or a way to do something (using the word method), use "method for".
But when speaking in manners of using a certain method to find out or conclude something, use "method to". 
Eg. Use the negating method to weaken the arguments conclusion.

Using the explanation above there is only one answer choice that stands out:
C) Coronary angiography, a sophisticated  method for diagnosing  coronary disease,  involves  the introduction of dye into the arteries of the heart and is now administered selectively, because  it  uses x-rays to observe cardiac function.  Correct structure.

Anwser choice D might be confusing at first but the use of "that" incorrectly modifies disease.
Coronary angiography, a sophisticated method to diagnose coronary disease  that  involves the introduction of a dye into the arteries of the heart, is now administered selectively, because it uses x-rays to observe cardiac function.

Hope this helps!

PS: i find it very helpful that you keep posting all this questions in forum, for discussion, etc. Kudos to you @maybeam!

ChrisLele · Answer

The correct idiom is 'method for diagnosing'. Eliminate (D), (E). The subject 'coronary angiography' is interrupted by the phrase, 'a sophisticated...'. As soon as that parenthetical phrase ends we need a verb that goes together with the subject. Only 'involves' does this. Therefore (C).

Hope that helps!

Hope that helps!

skovinsky · Answer

Hi!

When you see lots of clauses and phrases, think modification.

The problem with D is the phrase "that involves the introduction of dye"; since that phrase immediately follows "coronary disease", that's what it modifies. However, that doesn't make any sense; we want that phrase to modify "coronary angiography".

In C, we have a comma after disease, turning that whole clause into a parenthetical comment that we can ignore when evaluating the sentence. So, C actually reads:

which is exactly what we want.

maybeam · Answer

I agree that its the angiography that involves the introduction of the dye and not the diesase. 
But is the usage a correct usage.

I was confused b/w the forms

method for and method to

and choosed method to as right, though it turned out to be wrong. Can somebody help me on this?

PiyushK · Answer

Prominent misplaced modifier error in wrong choices: modifier is modifying diseases instead of angiography  
Coronary angiography, a sophisticated method for diagnosing coronary disease involving the introduction of a dye into the arteries of the heart, is now administered selectively, because it uses x-rays to observe cardiac function.
(A) for diagnosing coronary disease  involving the introduction of a dye into the arteries of the heart , is now administered selectively, because it uses
(B) for diagnosing coronary disease  involving the introduction of a dye into the arteries of heart , is now administered selectively, because of using
(C) for diagnosing coronary disease, involves the introduction of dye into the arteries of the heart and is now administered selectively, because it uses
(D) to diagnose coronary disease  that involves the introduction of a dye into the arteries of the heart , is now administered selectively, because it uses
(E) to diagnose coronary disease  involving the introduction of a dye into the arteries of the heart , which is now administered selectively, uses

brs1cob · Answer

i have still confusion between A and C. i found A grammatically correct but it is wrong meaning wise as it says "disease involves introduction of dye ..". but in C, there is something wrong with "and is". can anyone please explain the difference between A and C.

although i selected A, now i realize that A is wrong meaning wise.

C is correct.
CA,..., involves...., and is administered...

although i selected A, now i realize that A is wrong meaning wise.

C is correct.
 CA,..., involves...., and is administered...

tarunk31 · Answer

brs1cob

Coronary angiography, a sophisticated method for diagnosing  coronary disease involving  the introduction of a dye into the arteries of the heart, is now administered selectively, because it uses x-rays to observe cardiac function.

Here the present participle "involving" modifies the immediately preceding noun disease. But disease doesn't involve the introduction of a dye into the arteries of the heart but rather the method involves that. Therefore A is wrong.

C correctly describes the method by saying two things using parallel predicates: invoves... and is administered...

Hope it helps

kunalkrishnatrey · Answer

Hello,

Greetings for the day!

Can anybody please explain the usage of "method to" and "method for" ?

Thanks in anticipation!

Best,
Kunal

daagh · Answer

KUNAL

As far as I see, outside American English, I am not sure whether there is any difference between 'method for' and 'method to'. While 'method to', 'method of', 'method in' are described by many dictionaries, they have completely ignored 'method for'. 
The Free dictionary even says that the phrase 'method for diagnosing' is not found in the Dictionary and Encyclopedia. 
 
I would wait for someone to cite a dictionary link that describes the difference. Nevertheless, I still take Chris Lee's reasoning that method for diagnosing is the correct idiom as he ought to know better.

In addition, is it at least there in any of the idioms list flashed by the Gmat training companies?

Therefore, this question has to be decided on other merits than on idioms, I believe.

btrg · Answer

I go with C, but I have a question . i.e the stmt like

Coronary angiography, a sophisticated method for diagnosing coronary disease, involves the introduction of dye into the arteries of the heart and is now administered selectively, because  it  uses x-rays to observe cardiac function.

Will "it" (underlined abv) refer to the preceeding noun, if any, like heart in this case ? Becoz i want to confirm my understanding that the modifiers seperated by commas do not modify the actual statement i.e Coronary angiography uses x-rays to observe cardiac function.

daagh · Answer

btrg wrote

The basic tenet is that a pronoun should refer back to an eligible noun, whether is the near one or the farther one. Eligible means something that makes normal sense, not inappropriate meaning. The tenet also says that these pronouns normally fall back on the subject as the first choice but not necessarily. Supposing in this case, if the sentence happened to be, let us say, 'The doctor clarified that CA involves pumping a dye into the heart and therefore it is used selectively', then it cannot refer to the Doctor since we do not use 'it' for a Doctor.

Nor can we use it to refer to the disease or the heart, because neither a disease nor a heart can ever use x-rays. CA-only uses x-rays.

However, to your query about ' modifiers separated by commas' let me say that it should not confuse between a modifier and a pronoun. 'Because it uses x-rays to observe cardiac function' is a subordinate clause and not a modifier. The 'it' you have underlined is not a relative pronoun either such as 'comma+ which' or ' that', which have an obligation to refer to the nearest
Noun. That is the reason they are called relative pronouns.

You might also note that modifiers separated by comma +verb+ing (Ex: Tom always strived hard to some be admitted to the Wharton, dreaming about the mouth-watering placements he could get in the campus interviews.) modify the entire statement before which involves a doer and the doer's action.

You may perhaps like to clarify what you wish to convey by your idea that the modifiers separated by commas do not modify the actual statement.

Thanks.

Jsound996 · Answer

You can solve this in about 10 secs if you spot the huge meaning error in A, B, D and E:
"...diagnosing coronary disease involving the introduction of a dye... " and "...to diagnose coronary disease that involves the introduction of a dye..." is illogical because the procedure involves the introduction of a dye, not the disease itself!

Only answer choice C rectifies this mistake

harshbirajdar · Answer

No, I do not think there is a modifier issue here. The modifier  that  can usually jump prepositional phrases. In this case (option D), it can jump 'to diagnose coronary disease' and modify sophisticated method. The only plausible reason for not choosing option D would be the idiom error, IMO. And of course, I got it wrong :/ God bless non-native speakers.

anshul0130 · Answer

KarishmaB   ExpertsGlobal5  - Can you pls review below approach for this question and share your comments ?

Options A, B & E are wrong because of modifier error. Modifier involving the introduction of a dye modifies disease rather than Coronary angiography and this leads to meaning error.

Option D is also wrong with same reason. modifier that modifies disease rather than CA, leading to meaning error.

KarishmaB · Answer

PanpaliaAnshul 
Yes, when I read "disease involving..." or "disease that involves...", I am naturally looking for something that modifies the disease. I could ignore the prepositional phrase "for diagnosing coronary disease" and make it refer back to "coronary disease" but it does break the flow of the sentence. 
I do have an option that maintains the flow and does everything else right too. Hence, I pick (C).

JLI72 · Answer

Will A become correct if we add a comma before "involving"?

Coronary angiography, a sophisticated method for diagnosing coronary disease, involving the introduction of a dye into the arteries of the heart, is now administered selectively, because it uses x-rays to observe cardiac function.

ExpertsGlobal5 · Answer

Hello  PanpaliaAnshul ,

We hope this finds you well.

To answer your query, your reasoning here is, indeed, sound.

Kudos.

We hope this helps.
All the best!
Experts' Global Team

ExpertsGlobal5 · Answer

Hello  JLI72 ,

We hope this finds you well.

To answer your query, the addition of a comma before "involving" would not make Option A correct because Option A uses the present participle ("verb+ing" - "involving" in this case) to refer to information that is permanent in nature; please remember, information that is permanent in nature is best conveyed through the simple present tense.

We hope this helps.
All the best!
Experts' Global Team

theyesguy · Answer

I have an issue with C

I believe the main point of the sentence is

"Coronary angiography is now administered selectively, because it uses x-rays to observe cardiac function."

and the rest of the information modifies Angiography. But in C,..

"for diagnosing coronary disease, involves the introduction of dye into the arteries of the heart  and  is now administered selectively, because it uses"

..the underlined 'and' makes it into secondary info..

Please help.

Posted from my mobile device

Coronary angiography, a sophisticated method for diagnosing coronary

Prep Toolkit

Top 5 GMAT Debrief Videos

615 to 715 in 15 Days (Ria's Strategies)

More than Quant/Verbal Abilities: Speed vs. Accuracy

745 with Only Self-Prep and GMAT Club

From 555 to 765: 210-point Improvement

Perfect 805 Score Debrief by Julia

My Rewards

GMAT Sentence Correction (SC - EA only) Questions

Coronary angiography, a sophisticated method for diagnosing coronary

Prep Toolkit

615 to 715 in 15 Days (Ria's Strategies)

More than Quant/Verbal Abilities: Speed vs. Accuracy

745 with Only Self-Prep and GMAT Club

From 555 to 765: 210-point Improvement

Perfect 805 Score Debrief by Julia

My Rewards