Square of opposition relationships – UGC NET Question

B is correct: A (“All S are P”) and O (“Some S are not P”) are contradictories. C is correct because contradictories cannot both be true and cannot both be false. E is correct: I and O are subcontraries (they cannot both be false but may both be true). A is false (it describes contraries, not contradictories). D is false because A and E are contraries, not subcontraries. Thus B, C and E only are correct.

Option A:
Option A is incomplete because it omits E, a key relation on the square involving particular propositions.

Option B:
Option B is wrong because it adds D, which misclassifies A and E as subcontraries.

Option C:
Option C is correct because it includes exactly the true relationships and excludes A and D, which are incorrect.

Option D:
Option D is incorrect because it includes A, which misdefines contradictories.