The inspector was a vigilant young man.

A. intelligent

B. ambitious

C. watchful

D. smart

Answer: Option C

Solution(By Examveda Team)

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


Synonym of vigilant is watchful