Which of the following statements is contradictory to the statement All dogs are friendly animals?

ANo dogs are friendly animals

BSome friendly animals are not dogs

CSome friendly animals are dogs

DSome dogs are not friendly animals ✓ Correct

Correct answer: (D) Some dogs are not friendly animals

Explanation

Some dogs are not friendly animals is the contradictory of the given statement.

All dogs are friendly animals is a universal affirmative A.

The contradictory of A is the particular negative O over the same terms.

That O form is Some dogs are not friendly animals.

A and O always take opposite truth values, defining contradiction.

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