The inspector was a vigilant young man.

A. smart

B. watchful

C. ambitious

D. intelligent

Answer: Option B

Solution(By Examveda Team)

Smart : (of a person) clean, tidy, and well dressed.
Watchful : watching someone or something closely; alert and vigilant.
Ambitious : having or showing a strong desire and determination to succeed.
Intelligent : having or showing intelligence, especially of a high level.
Vigilant : keeping careful watch for possible danger or difficulties.

Synonym of Vigilant is Watchful

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