PT 60 S1 Q17

Humankind would not have survived, as it clearly has,if our ancestors had ... ...

Which one of the following arguments is most similar in its reasoning to the argument above?
(A) Students do not raise their grades if they do not increase the amount of time they spend studying. Increased study time requires good time management. However, some students do raise their grades. So some students manage their time well.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Complete Section: LR-A, June '10 LSAT (PT 60 Sec. 1)