The biggest thing that jumps out at me here is the word "and." Something has to be parallel with the phrase that follows the word "and." And I think we're in good shape: "... one of Kirchhoff's laws, an observation about electric current first made in 1845 and now included in virtually every textbook of elementary physics." Cool, "first made in 1845" and "now included in virtually every textbook" both modify "an observation about electric current" -- and that makes perfect sense.

So let's keep (A).


The "which" jumps out at me first in (B): "which was an observation..." modifies "one of Kirchoff's laws." That's OK, though we probably don't really even need the phrase "which was." It's not a big deal, but (A) is more succinct because it skips those extra couple of words. That's not a definite error, but it's a mild reason to prefer (A) over (B).

The bigger problem is the parallelism. Following the "and", we have a brand-new clause: "it is now included in virtually every textbook..." But I don't think that the clause is logically parallel to anything. And more importantly: there's no good reason to start a brand-new clause here, partly because we're just trying to describe the observation, so a simple modifier would be cleaner than a brand-new clause.

So (B) isn't a complete disaster, but it's definitely not as good as (A).


This is a classic comma splice:

• Independent clause #1: "In 1995 Richard Stallman, a well-known critic of the patent system, testified in Patent Office hearings that, to test the system, a colleague of his had managed to win a patent for one of Kirchhoff's laws..."
• Independent clause #2: "...it was an observation about electric current first made in 1845 and now included in virtually every textbook of elementary physics."

Those two independent clauses are separated by only a comma, and that's not cool. (Commas and comma splices are very briefly discussed in this YouTube video on GMAT punctuation if you're curious to learn more about that crap.) So we can eliminate (C).


(D) has basically the same comma splice problem as (C):

• Independent clause #1: "In 1995 Richard Stallman, a well-known critic of the patent system, testified in Patent Office hearings that, to test the system, a colleague of his had managed to win a patent for one of Kirchhoff's laws..."
• Independent clause #2: "...it is now included in virtually every textbook of elementary physics."

So (D) is out, too.


(E) isn't a total disaster, but it's definitely not as good as (A).

For starters, I'm not sure why we would say something like "...one of Kirchoff's laws that was an observation about electric current..." First, there's no good reason to emphasize the past tense in this case: sure, the observation was first made in the past, but there's no good reason to suggest that the law itself somehow existed only in the past -- and that's exactly what seems to be happening in (A). Second, the phrase "one of Kirchoff's laws that was an observation about electric current" suggests that Kirchoff had other laws that were NOT about electric current, and we have no idea if that's actually the case.

The other problem is the placement of the modifier "first made in 1845." This is subtle and annoying, but because "first made in 1845" is surrounded by commas (an appositive phrase, if you like grammar jargon), it seems to modify ONLY the preceding noun, "electric current." So if we think about the sentence strictly and literally, it's saying that electric current was first made in 1845, and that's really not what the sentence is trying to say -- it's trying to say that the observation was first made in 1845, not the electric current itself.

So (E) can be eliminated, and (A) is the best we can do.
_________________

GMAT Club Verbal Expert | GMAT/GRE tutor @ www.gmatninja.com (Now hiring!) | Instagram | Food blog | Notoriously bad at PMs

Beginners' guides to GMAT verbal
Reading Comprehension | Critical Reasoning | Sentence Correction

YouTube LIVE verbal webinars
Series 1: Fundamentals of SC & CR | Series 2: Developing a Winning GMAT Mindset

SC & CR Questions of the Day (QOTDs), featuring expert explanations
All QOTDs | Subscribe via email | RSS

Need an expert reply?
Hit the request verbal experts' reply button -- and please be specific about your question. Feel free to tag @GMATNinja in your post. Priority is always given to official GMAT questions.

Sentence Correction articles & resources
How to go from great (760) to incredible (780) on GMAT SC | That "-ing" Word Probably Isn't a Verb | That "-ed" Word Might Not Be a Verb, Either | No-BS Guide to GMAT Idioms | "Being" is not the enemy | WTF is "that" doing in my sentence?

Reading Comprehension, Critical Reasoning, and other articles & resources
All GMAT Ninja articles on GMAT Club | Using LSAT for GMAT CR & RC |7 reasons why your actual GMAT scores don't match your practice test scores | How to get 4 additional "fake" GMAT Prep tests for $29.99 | Time management on verbal

C - 'namely', it was ... - awkward construction
D - ,it is .. creating 'run-on' sentense
E - that restricts the laws and wrongly used here

A, B - left

B - wordy
A - best

OA is 'A'.

Just to add to the discussions:
IMO


(A) laws, an observation about electric current first made in 1845 and
(B) laws, which was an observation about electric current first made in 1845 and it is
--> Pronoun reference problem. 'It' can refer to electric current/laws/observation
(C) laws, namely, it was an observation about electric current first made in 1845 and --> nonsense
(D) laws, an observation about electric current first made in 1845, it is --> Similar to (b). Pronoun reference issue.
(E) laws that was an observation about electric current, first made in 1845, and is --> Modifier Problem. Sounds like current was made in 1865

Thanks

In 1995 Richard Stallman, a well-known critic of the patent system, testified in Patent Office hearings that, to test the system, a colleague of his had managed to win a patent for one of Kirchhoff's laws, an observation about electric current first made in 1845 and now included in virtually every textbook of elementary physics.

can someone help me understand how "Kirchhoff's laws, an observation about electric current first made in 1845 and now included in virtually every textbook of elementary physics " is not like a sentence fragment.
I thought something like
"Kirchhoff's laws, an observation about electric current first made in 1845 and IS NOW included in virtually every textbook of elementary physics "

---- would make more sense cause now we are adding a verb ... what am i missing here . can some1 shed some light here,

I also got the answer as A. Want to make sure whether my logic is correct.

A) Correct
B) The sentence as a whole talks about the patent system. Hence use of which(non-essential modifier) is appropriate but introduces a parallelism error with and it is
C) namely, it was an.. makes the construction awkward.
D) Removing the fluff we get:
In 1995 Richard Stallman, a well-known critic of the patent system, testified in Patent Office hearings that, to test the system, a colleague of his had managed to win a patent for one of Kirchhoff's laws ,an observation about electric current first made in 1845, it is now included in virtually every textbook of elementary physics
Creates a run-on sentence
E) I have a doubt here. According to me, the use of that was is correct and also it maintains the parallel structure. Also that correctly modifies the one of the laws. What does first made in 1845 modify? (btw IMO it modifies observation correctly). So Why is this option wrong?

I marked this option as the answer using the following rule, the topic of discussion in the sentence is testifying of Richard Stallman, the use of that.. introduces a restrictive clause. Am I correct?

Also if one of the option would have been something as below then what would be the answer?

laws, which was an observation about electric current, first made in 1845, and is

Can anyone or any expert help me out with this?
_________________

Kudos plz if it helped

Hi Sir,
Can you please help me to clear my concept.

laws, an observation about electric current first made in 1845 and now included >>> This is the modifier

I think that this is a run on as obervation made and now included requires a verb?Isn't it?
I might be asking a silly one but pls clarify with any supportive examples.

[quote="wininblue"]in 1995 Richard Stallman, a well-known critic of the patent system, testified in Patent Office hearings that, to test the system, a colleague of his had managed to win a patent for one of Kirchhoff's laws, an observation about electric current first made in 1845 and now included in virtually every textbookof elementary physics.


A laws, an observation about electric current first made in 1845 and - Correct.

B laws, which was an observation about electric current first made in 1845 and it is - which not used correctly, no comma after 1845.

C laws, namely, it was an observation about electric current first made in 1845 and - wrong 'namely' is not used correctly.

D laws, an aobservation about electric current first made in 1845, it is - wrong there cannot be two independent clauses in a sentence without a connector.

E laws that was an observation about electric current, first made in 1845, and is - wrong seems like the electric current was made in 1845.

In 1995 Richard Stallman, a well-known critic of the patent system, testified in Patent Office hearings that, to test the system, a colleague of his had managed to win a patent for one of Kirchhoff's laws, an observation about electric current first made in 1845 and now included in virtually every textbook of elementary physics.

(A) laws, an observation about electric current first made in 1845 and
Correct

(B) laws, which was an observation about electric current first made in 1845 and it is
1. Which was --SV agreement
2. Law still exists; we can't use past tense
3. It has no referent

(C) laws, namely, it was an observation about electric current first made in 1845 and
Wordy

(D) laws, an observation about electric current first made in 1845, it is
Run on

(E) laws that was an observation about electric current, first made in 1845, and is
That was has SV agreement
_________________

Kudos if my post helps!

Long And A Fruitful Journey - V21 to V41; If I can, So Can You!!
Preparing for RC my way
RC Summary Activity - New Project to imporve RC Skills
Bloomberg's US Bschool Ranking

My study resources:
1. Useful Formulae, Concepts and Tricks-Quant | 2. e-GMAT's ALL SC Compilation | 3. LSAT RC compilation | 4. Actual LSAT CR collection by Broal | 5. QOTD RC (Carcass) | 6. Challange OG RC | 7. GMAT Prep Challenge RC

Reference error

(A) laws, an observation about electric current first made in 1845 and

(B) laws, which was an observation about electric current first made in 1845 and it is

(C) laws, namely, it was an observation about electric current first made in 1845 and

(D) laws, an observation about electric current first made in 1845, it is

(E) laws that was an observation about electric current, first made in 1845, and is