Square of opposition relations – UGC NET Question

Statements A, B, C and D correctly describe the relations of contrariety and subcontrariety in the traditional square, and F is true about exam usage. E is false because modern logic’s treatment of universal propositions without assumed existential import undermines some of the classical relationships. Thus the correct set of true statements is A, B, C, D and F only.

Option A:
Option A is correct since it includes all the accurate relational claims plus the observation that UGC NET may still use the traditional framework. It excludes E, which overstates the continuity between traditional and modern logic. This makes the option consistent with both history and syllabus.

Option B:
Option B is incomplete, as it omits F and therefore does not mention the exam context. While A, B, C and D are true, the option fails to cover all the correct statements listed.

Option C:
Option C is wrong because it includes E, which incorrectly claims that all traditional relations survive in modern treatment unchanged. This conflicts with standard modern logic texts, so the combination cannot be accepted.

Option D:
Option D is incorrect since it leaves out B, omitting the key general statement about contraries, and thus does not contain all true statements. Consequently, it does not represent the full correct set.