PT 30 S4 Q13

   Joseph: My encyclopedia says that the mathematician Pierre ... ...

Joseph's statement that "this alleged theorem simply cannot be proved" plays which one of the following roles in his argument?
(A) an assumption for which no support is offered
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Practice Set: "Method/Function" Questions, Set 2 - Func