ANNIHILATE :

A. Destroy

B. Entrain

C. Forward

D. testify

Answer: Option A

Solution(By Examveda Team)

Entrain :climb, ascend, climb up, entrain, board, mount.
Forward :toward the front; in the direction that one is facing or traveling.
Testify :give evidence as a witness in a law court.
Destroy :put an end to the existence of (something) by damaging or attacking it.
Annihilate :destroy utterly obliterate.

Synonym of Annihilate is Destroy.