All fire-breathing dragons are warm blooded lizards. Therefore, all warm blooded lizards are fire-breathing dragons.
A) Invalid, illicit contrary.
B) Invalid, illicit contraposition.
C) Invalid, existential fallacy.
D) Invalid, illicit conversion.
E) Valid.

Question

Quizplus · Accepted Answer

The argument commits the fallacy of illicit conversion by assuming that a statement and its converse are logically equivalent. However, just because all fire-breathing dragons are warm blooded lizards, it does not necessarily follow that all warm blooded lizards are fire-breathing dragons. There could be other warm-blooded lizards that do not possess the ability to breathe fire.

All Fire-Breathing Dragons Are Warm Blooded Lizards