For quick promotion, he hit on a plan to propitiate the Manager.

Answer: Option D

Evict : expel (someone) from a property, especially with the support of the law.
Incite : encourage or stir up (violent or unlawful behaviour).
Praise : express warm approval or admiration of.
Conciliate : stop (someone) being angry or discontented; placate.
Propitiate : win or regain the favour of (a god, spirit, or person) by doing something that pleases them.

Synonym of Propitiate is Conciliate