December 2003 LSAT
Section 2
Question 14
Ravi on November 11, 2020
@liwenong28, let's look. This is a strengthen with a necessary premise question, so we can negate the answer choices to see which one is correct. The correct answer choice, when negated, will wreck the argument. D's negation says, "The social behaviors of macaques are not completely independent of their genetic heritage." D is sufficient to prove the conclusion because it states that the monkeys' social behavior is never determined by genetics; however, its' not necessary for the argument to assume that all social behaviors are independent of genetics. We simply just need to know that some behaviors are independent. Thus, D is too strong to be necessary.