All flying reindeer are happy creatures. Therefore, no flying reindeer are unhappy creatures.
A) Invalid, illicit obversion.
B) Invalid, existential fallacy.
C) Invalid, illicit contraposition.
D) Valid.
E) Invalid, illicit contrary.

Question

Quizplus · Accepted Answer

The argument follows a valid form of categorical syllogism known as the A-type proposition. The major premise is an A proposition (all flying reindeer are happy creatures), and the minor premise is also an A proposition (no flying reindeer are unhappy creatures). The conclusion is then drawn from the premises by the law of the syllogism, which is a valid inference rule.

All Flying Reindeer Are Happy Creatures