Which relation holds between two propositions having the same subject and predicate but differing in both quality and quantity?

AContrary opposition

BContradictory opposition ✓ Correct

CSub-alternation

DSub-contrary opposition

Correct answer: (B) Contradictory opposition

Explanation

Two propositions with the same subject and predicate differing in both quality and quantity are contradictories.

The pairs are A with O and E with I.

One is universal, the other particular, and one affirms while the other denies.

Contradictories can never both be true nor both be false.

Opposition in both quality and quantity defines the contradictory relation.

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