One who talks very little

A. Reserved

B. Mute

C. Phlegmatic

D. Stoic

Answer: Option A

Solution(By Examveda Team)

One word substitute is Reserved.

Reserved: slow to reveal emotion or opinions.
Mute: refraining from speech or temporarily speechless.
Phlegmatic: (of a person) having an unemotional and stolidly calm disposition.
Stoic: a person who can endure pain or hardship without showing their feelings or complaining.