Select the opposite (antonym) of COMPULSORY

Options

A. A) easy
B. B) optional
C. C) unnecessary
D. D) mandatory

Answer

B

Explanation

optional (Adjective) : that you can choose to do or have if you want to
compulsory (Adjective) : mandatory: that must be done because of a law/a rule
easy (Adjective): that is simple to do
unnecessary (Adjective) : not required/needed, not necessary mandatory (Adjective) : compulsory: required by law