Some teachers are extremely fussy and any answer you give would not satisfy them. You would have to rewrite the sentence so there is no ambiguity. (who has the strong stomach -- the pig or the javelina. The way the sentence is written, it is the pig (it is the closest noun to the it).
I am not that fussy and the correct answer, given this sentence is
The answer is B, you never give personal information and expository is an explaining essay so there is no need to persuade because there is no argument occurring
