He could not suppress his resentment against that decision.

A. excitement

B. contentment

C. displeasure

D. happiness

Answer: Option C

Solution(By Examveda Team)

Excitement : a feeling of great enthusiasm and eagerness.
Contentment : a state of happiness and satisfaction.
Displeasure : a feeling of annoyance or disapproval.
Happiness : the state of being happy.
Resentment : bitter indignation at having been treated unfairly.

Synonym of Resentment is Displeasure