Which of the Following Arguments Commits the Ad Hominem Fallacy

Which of the following arguments commits the ad hominem fallacy?

A) No man can experience childbirth, and therefore no man can give a first-person account of the experience.
B) Storage containers are made in many different sizes, but I cannot get the size I need because my local store doesn't carry that size.
C) If the politician is not trustworthy, then he should not be elected.And he is not trustworthy.
D) Myrtle told me that Sally heard from James that Bill saw Ryan spreading gossip.So it must be true.
E) Sarah claims that Napoleon provided canned food to his troops, but she's never had a single history class, so we shouldn't listen to her.