Tautology contradiction and contingency – UGC NET Question

All five statements A through E are correct descriptions of standard logical classifications and their exam use. Tautologies are true under all assignments, contradictions are always false, and contingencies vary with the assignment. A statement and its negation cannot both be tautologies because their truth-values must differ somewhere. Recognising tautological patterns is useful in UGC NET for spotting valid argument forms.

Option A:
Option A is incomplete because it omits E, missing the applied exam-use point.

Option B:
Option B is correct since it includes every true statement (A–E).

Option C:
Option C is wrong because it omits C (definition of contingency).

Option D:
Option D is incorrect because it omits A (definition of tautology).