I think that the B) case is pretty obvious. In particular, because "makes sense" is a MUCH wider criterion than "supporting and defending the Constitution".

In the specific case of Hering, he was was worried about the President being (temporarily?) insane. Given that he was in no position to make a mental health diagnosis, his position essentially boiled down to saying that his perception of the situation overrides his (presumably) direct orders -- and that's not because the President suddenly became a domestic enemy and a threat to the Constitution.