Answer: Option C
Submit : accept or yield to a superior force or to the authority or will of another person.
Oppress : keep (someone) in subjection and hardship, especially by the unjust exercise of authority.
Subdue : overcome, quieten, or bring under control (a feeling or person).
Surrender : stop resisting to an enemy or opponent and submit to their authority.
Subside : become less intense, violent, or severe.
Synonym of Subside is Subdue