Defection is quite common in our present day political life.

Answer: Option A

Desertion : the action of deserting a person, cause, or organization.
Disobedience : failure or refusal to obey rules or someone in authority.
Disloyalty : the quality of not being loyal to a person, country, or organization; unfaithfulness.
Indiscipline : lack of discipline.
Defection : the desertion of one's country or cause in favour of an opposing one.

Synonym of Defection is Desertion