Synonym of OBSTREPEROUS

Answer: Option C

Obstinate : stubbornly refusing to change one's opinion or chosen course of action, despite attempts to persuade one to do so.
Calm : not showing or feeling nervousness, anger, or other strong emotions.
Noisy : making or given to making a lot of noise.
Cheerful : noticeably happy and optimistic.
Obstreperous : noisy and difficult to control.

Synonym of Obstreperous is Noisy