V06-05

Nuclear testing on the planet is regulated by the Comprehensive Nuclear-Test-Ban-Treaty,which was signed in 1996 by 71 states and prohibits all nuclear explosions, disallows scientific research, and is providing guidelines for proper handling of radioactive material to protect the environment.

A. which was signed in 1996 by 71 states and prohibits all nuclear explosions, supports disallows scientific research, and is providing guidelines for proper handling of radioactive material to protect the environment.
B. which was signed in 1996 by 71 states and prohibits all nuclear explosions, disallows scientific research, and provides guidelines for proper handling of radioactive material to protect the environment.
C. which, had being signed in 1996 by 71 states, prohibits all nuclear explosions, disallows scientific research, and guidelines for proper handling of radioactive material to protect the environment.
D. which was signed in 1996 by 71 states prohibiting all nuclear explosions, and disallowing scientific research and the radioactive material’s proper handling guidelines to protect the environment.
E. having been signed in 1996 by 71 states and prohibits all nuclear explosions, disallows scientific research, and provides guidelines for proper handling of radioactive material to protect the environment.
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Official Solution:

Nuclear testing on the planet is regulated by the Comprehensive Nuclear-Test-Ban-Treaty,which was signed in 1996 by 71 states and prohibits all nuclear explosions, disallows scientific research, and is providing guidelines for proper handling of radioactive material to protect the environment.

A. which was signed in 1996 by 71 states and prohibits all nuclear explosions, supports disallows scientific research, and is providing guidelines for proper handling of radioactive material to protect the environment.
B. which was signed in 1996 by 71 states and prohibits all nuclear explosions, disallows scientific research, and provides guidelines for proper handling of radioactive material to protect the environment.
C. which, had being signed in 1996 by 71 states, prohibits all nuclear explosions, disallows scientific research, and guidelines for proper handling of radioactive material to protect the environment.
D. which was signed in 1996 by 71 states prohibiting all nuclear explosions, and disallowing scientific research and the radioactive material’s proper handling guidelines to protect the environment.
E. having been signed in 1996 by 71 states and prohibits all nuclear explosions, disallows scientific research, and provides guidelines for proper handling of radioactive material to protect the environment.


A. The phrase “is providing guidelines ….” is not parallel in structure with “was signed in 1996 by 71 states,” “prohibits all nuclear explosions” and “supports scientific research.” All the list elements should have parallel structures.

B. CORRECT. The phrase “provides guidelines ….” is parallel in structure with “was signed in 1996 by 71 states,” “prohibits all nuclear explosions” and “supports scientific research.” All the list elements are parallel and the sentence does not contain any other verb/tense error.

C. The verb construction “had being signed” is awkward and grammatically incorrect.

D. Using the verb-ing form “prohibiting” just after the “states” incorrectly implies that the states are prohibiting “all nuclear explosions”; the treaty is the one which is doing the “prohibiting”.

E. First, the modifier introduced by the word “having” is grammatically incorrect and modifies the subject rather than preceding clause; verb phrases must be preceded by a relative pronoun such as "which." Moreover, the modifier “having been signed in 1996 …” is not parallel with verb phrases “prohibits …, disallows …, and provides….”


Answer: B
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Bunuel I need clarification regarding this.
Nuclear testing on the planet is regulated by the Comprehensive Nuclear-Test-Ban-Treaty,which was signed in 1996 by 71 states and prohibits all nuclear explosions.

IMO Prohibits all nuclear explosions is not a independent clause.Thereby I thought that These two sentences cannot be joined by "AND".
Please clarify

I think this is a poor-quality question and I agree with explanation. Answer choice A does not mirror the original sentence, as it should be the case for a GMAT Sentence Correction Question.

Why does choice A not mirror the original underline? Choice A states "supports disallows" when the original only states "disallows".
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Although I chosed the correct answer, I don't understand why having "and" is correct here (see the bold word)

which was signed in 1996 by 71 states and prohibits all nuclear explosions, disallows scientific research, and provides guidelines for proper handling of radioactive material to protect the environment.

Should it be replaced by a comma?
Bunuel

Got confused of the items in parallel because of "and" before prohibits.

There are 2 parallel lists.
Parallel 1 modifier for Treaty- which was signed in 1961 and prohibits few things such as X,Y and Z
Parallel list 2 - X , Y and Z