“Tautology” means saying the same thing using different words—redundantly.
Examples: “free gift”, “true fact” — unnecessary repetition.
Evaluate the options:
(A) Repetition – general term, not precise enough.
(B) Temerity – means excessive confidence.
(C) Tarragon – is a herb! Irrelevant.
(D) Tautology – exact definition match.
Therefore, (D) is the correct answer.