We are working on a new set of Verbal Tests for GMAT Club. Several members have responded to our "

Help Wanted Ad" and submitted their questions. I am posting the first batch and would love to hear your feedback about the questions. I would also like to know your opinion about how close this question is to the Real GMAT (or Official Guide if you have not taken the GMAT yet) on a 1-5 scale where

1 is not close at all

2 is not close

3 is average/undecided

4 is close

5 is exact match

I will post the OA and Explanation in 1-3 days, depending on how many takers we get. Your feedback will help significantly and very much appreciated!

By the end of 2008, 180 countries had signed the Comprehensive Nuclear-Test-Ban Treaty (CTBT), which forbids all nuclear explosions, including the explosive testing of nuclear weapons.A. 180 countries had signed the Comprehensive Nuclear-Test-Ban Treaty (CTBT), which forbids all nuclear explosions,

B. 180 countries signed the Comprehensive Nuclear-Test-Ban Treaty (CTBT), forbidding all nuclear explosions,

C. the Comprehensive Nuclear-Test-Ban Treaty (CTBT) was signed by 180 countries, which forbid all nuclear explosions,

D. the Comprehensive Nuclear-Test-Ban Treaty (CTBT) had been signed by 180 countries that forbid all nuclear explosions,

E. the Comprehensive Nuclear-Test-Ban Treaty (CTBT) was signed by 180 countries, forbidding all nuclear explosions,

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