The implications are not clear. I suspect you only think they're clear because you already know the classical problem, or perhaps because you have more faith in the good intentions of strangers than I do. My personal reaction to the scenario described in the comic would be that the host was trying to trick me because it would make for more dramatic television (only revealing the goat because I'd picked the car), and the correct decision would be to refuse the offer.

Your belief (a) is compatible with my common sense assumption that the host's goal is to maximize drama by making me lose the car, not to help me. Your belief (b) is incompatible with my assumption, but it is not required by the wording of the Math Goblins problem. Your belief (c) is compatible with my assumption.

All of Jensson's comments in this discussion are correct, and they are being unfairly downvoted.