One Word Substitutes - Verbal and Reasoning

Directions to SolveIn questions given below out of four alternatives, choose the one which can be substituted for the given word/sentence.
Q1:

Habitually silent or talking little

A Servile

B Unequivocal

C Taciturn

D Synoptic

ANS:C - Taciturn

Taciturn means tending to be silent and uncommunicative, reticent.