Their meeting was rather boisterous.

A. quiet

B. business like

C. noisy

D. calm

Answer: Option A

Solution(By Examveda Team)

Boisterous : noisy, energetic, and cheerful.
Quiet : making little or no noise.
Business : a person's regular occupation, profession, or trade.
Noisy : making or given to making a lot of noise.
Calm : not showing or feeling nervousness, anger, or other strong emotions.

Antonym of Boisterous is Quiet