Which of the following is contradictory to the statement No birds are mammals?
ASome birds are not mammals
BSome birds are mammals ✓ Correct
CAll birds are mammals
DAll mammals are birds
Correct answer: (B) Some birds are mammals
Explanation
The contradictory is Some birds are mammals.
The given proposition is the E form No birds are mammals.
The contradictory of an E proposition is the corresponding I proposition.
This replaces universal denial with particular affirmation on the same terms.
So Some birds are mammals contradicts No birds are mammals, both never sharing a truth value.
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