In order to comprehend how prehistoric human societies

In order to comprehend how prehistoric human societies were organized and how interactions between people took place at that time, scientists are studying modern societies in specific contexts (such as troops during Vietnam War, hippie communities in the 70’s and religious brotherhoods). A flaw pointed in this approach is that though they are still talking of humans, evolution has made comparisons rather meaningless.
Type - Weaken

(A) Human specimens from ancient times have been proved to show several important instinctive behaviors similar to modern people. -- This gives a reason to study modern people since modern people share several important instinctive behaviors with ancient people - Correct
(B) Prehistorical societies are separated from modern ones by 30 thousand years of human evolution. - This is irrelevant or may be a mild strengthener
(C) Theories of prehistorical societies have recently undergone a radical paradigm change. - Incorrect - we are not sure how much time recently is used to denote
(D) The study of societies is a much consolidated discipline. - Irrelevant
(E) Many sociologists nowadays do not study prehistorical societies to establish comparisons with modern societies. - Incorrect

Answer A