PT 4 S4 Q8

Prominent business executives often play active roles in United States ... ...

Which one of the following, if true, most seriously weakens the proposed explanation of why business executives do not run for president?
(A) Many of the most active presidential fundraisers and backroom strategists are themselves politicians.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Practice Set: "Weaker" Questions, Set 1