Which one of the following can most reasonably be inferred from the passage? ... ...

Which one of the following can most reasonably be inferred from the passage?
(A)  In at least some fields of human endeavor, it would be difficult, or perhaps even impossible, to ascertain whether or not a superior performer with extensive training has exceptional innate talent. 

(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in PT71 (Dec 2013): Reading Comprehension