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Bunuel
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Bunuel
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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.
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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?
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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.
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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
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I think this is a high-quality question and I agree with explanation.
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Bunuel
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.

Looking at some of the questions above, adding the structure of the correct choice B:

Nuclear testing on the planet is regulated by the Comprehensive Nuclear-Test-Ban-Treaty,

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

The above is an example of a list within a list (nested list).

Remember: A list can have items in different tenses provided they are conveying relevant information.

Hope this helps you :)
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