Tautology, contradiction and contingency – UGC NET Question

Statements A and B correctly define tautology and contradiction, D states that truth tables are a systematic method to classify statements and E rightly explains that contingent statements are sometimes true and sometimes false. Statement C is false because it mistakenly assigns the property of tautology to contingent statements by saying they are true in all situations. Consequently, A, B, D and E together form the only correct combination.

Option A:
Option A is correct because it lists exactly the statements that match standard logical definitions and excludes C, which confuses contingency with tautology. It reflects the approach used in UGC NET when analysing compound statements.

Option B:
Option B is incomplete since it omits E and therefore does not describe how contingent statements behave across different truth assignments. Without E, the classification of logical status is less complete.

Option C:
Option C is wrong because it leaves out A and thereby fails to define tautology explicitly, while still not correcting the misstatement about contingency. Although some included statements are true, the set is not complete.

Option D:
Option D is incorrect because it includes C, the false description of contingent statements, and so mixes an error with otherwise true statements. That mixture makes the option logically inconsistent.