Correct option is A
The correct synonym of the given word is (a) refute.
Contradict: to assert the opposite of a statement or idea.
Synonyms: deny, dispute,
refute.
Antonyms: affirm, confirm, corroborate.
Meanings of all options:
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Refute: to prove a statement or theory to be wrong or false.
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Agree: to have the same opinion.
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Advise: to offer suggestions about the best course of action.
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Shorten: to make or become shorter.