A person who is always dissatisfied

A. Heretic

B. Felon

C. Malcontent

D. Surrogate

Answer: Option C

Solution(By Examveda Team)

One word substitute is Malcontent.

Heretic: a person believing in or practising religious heresy.
Felon: a person who has committed a felony.
Malcontent: a person who is dissatisfied and rebellious.
Surrogate: a substitute, especially a person deputizing for another in a specific role or office.