I think the point is more, don't even bother giving the choice. Just do the right thing which will maximize the survival of the patient, which is B in this case. People on the verge of death from illness aren't in the best place to be making logical decisions, and that's assuming that they're even still conscious or can talk (many of them are unconscious at this point and/or intubated).

Just follow the Socratic oath and don't over-complicate things. Give the necessary treatments.