Synonym of RIVAL

Answer: Option C

Enemy : a person who is actively opposed or hostile to someone or something.
Claimant : a person making a claim, especially in a lawsuit or for a state benefit.
Competitor : a person who takes part in a sporting contest.
Partner : either of a pair of people engaged together in the same activity.
Rival : a person or thing competing with another for the same objective or for superiority in the same field of activity.

Synonym of Rival is Competitor