PT 27 S4 Q24

Scientists, puzzled about the development of penicillin-resistant bacteria... ...

Which one of the following most accurately characterizes the role played in the passage by the unstated assumption that some patients who take penicillin develop bacteria with an immunity to penicillin?
(A) It is a hypothesis that is taken by the scientists to be conclusively proven by the findings described in the passage.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Method/Function: Intro Set