Answer: Option C
Efficiency : the state or quality of being efficient.
Competition : the activity or condition of striving to gain or win something by defeating or establishing superiority over others.
Ability : possession of the means or skill to do something.
Compensation : something, typically money, awarded to someone in recognition of loss, suffering, or injury.
Competence : the ability to do something successfully or efficiently.
Synonym of Competence is Ability