Select the most appropriate ANTONYM of the highlighted word in the following sentence.
The managing director produced cogent reasons for the change in HR policies.

Correct option is B

Cogent means clear, logical, and convincing.
 Unconvincing means not persuasive or compelling.
 Therefore, the correct option is (b) Unconvincing.
 Synonyms: clear, compelling, convincing, effective, persuasive, powerful, strong.
 Antonyms: unpersuasive, unconvincing, weak, ineffective, feeble.
Meaning of the given words:
 Compelling means evoking interest, attention, or admiration in a powerfully irresistible way.
 Pertinent means relevant or applicable to a particular matter.
 Unexpected means not expected or anticipated.