Synonyms are words which have the same or nearly the same meaning in the same language.
Antonyms are words which have opposite meaning in comparison to the other.
Option B)disprove is correct as the word prove means demonstrate the truth or existence of (something) by evidence or argumentand the word disprove means prove that (something) is false. Both the words are opposite of each other.
The other options are not correct as vapid, disincline, and atone are not the opposites of the word prove.