The word that you think is the antonym for - 'VEX' is :

(A) plague
(B) mitigate
(C) vixen
(D) soothe

Choose the correct answer from the options given below :

(D) Only

VEX means to annoy, upset, or trouble someone.

(A) plague means to trouble or annoy → similar meaning, not opposite
(B) mitigate means to reduce severity → not a direct opposite
(C) vixen refers to a female fox → unrelated
(D) soothe means to calm or relieve → opposite of vex

Thus, SOOTHE is the antonym for VEX. Soothe means to calm, pacify, or alleviate. It represents the opposite action, as it involves easing or relieving irritation or annoyance.