Which of the following statements is the contrapositive of Some dogs are not aggressive animals?

ASome aggressive animals are not dogs

BSome dogs are aggressive animals

CSome non-dogs are aggressive animals

DSome non-aggressive animals are not non-dogs ✓ Correct

Correct answer: (D) Some non-aggressive animals are not non-dogs

Explanation

Some non-aggressive animals are not non-dogs is the contrapositive sought.

The given form is O, Some dogs are not aggressive animals.

Contraposition replaces the subject by the complement of the predicate and the predicate by the complement of the subject.

For an O proposition Some S are not P this yields Some non-P are not non-S.

Here that reads Some non-aggressive animals are not non-dogs, a valid equivalent.

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