PT 63 S1 Q19

Anthropologist: It was formerly believed that prehistoricHomo sapiens ... ...

Which one of the following is an assumption required by the anthropologist’s argument?
(A) At least some Neanderthals lived at the same time and in the same places as prehistoric Homo sapiens ancestors of contemporary humans.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in June 2011 LSAT (PT 63): Logical Reasoning A