Benign :

A. Malevolent

B. Soft

C. Friendly

D. Unwise

Answer: Option A

Solution(By Examveda Team)

Soft : easy to mould, cut, compress, or fold, not hard or firm to the touch, soft, bland, malleable, moderate, tender, flaccid
Friendly : kind and pleasant.
Unwise : (of a person or action) not wise or sensible, foolish.
Malevolent : having or showing a wish to do evil to others.
Benign : gentle and kind.

Appropriate antonym of Benign is Malevolent.