PT 66 S2 Q19

Social scientist: Since the body of thought known asMarxism claims to ... ...

The social scientist’s conclusion follows logically if which one of the following is assumed?
(A) The description that Marxism gives of certain historical phenomena in the economic sphere is as rigorous as it is claimed to be.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in June 2012 LSAT (PT66): Logical Reasoning A