Sentence 1: Almost everyone in GAO probably has worked on a case study at one time or another yet may be unfamiliar with what is meant, methodologically, by a case study.

Sentence 2: Staff working in the GAO will almost never perform a case study during employment.
OPT:
[A]. yes.
[B]. it is not possible to tell.
[C]. no.
Is this second sentence entailed by the first sentence?
[C].