RonPurewal Wrote:choice A is the negation of "People in western Africa developed staple crops that they stopped cultivating once rice and yams were introduced".
that sentence should make perfect sense -- so, just think of choice A as saying "that sentence is false".
Thank you Ron for the explanation and many other explanations.They have helped me a lot.
And Ron,it makes sense to think of choice A as a negation of another statement (with respect to gmat),but can such statements stand alone in general?
RonPurewal Wrote:by the way, i've noticed that no one has posted the original source of this problem anywhere in this thread. there can be absolutely no further discussion of this problem until someone posts the original source, as per the forum rules.
thanks.
I have come across this question in gmatprep software.