What do you call a word that has the opposite meaning of another word? A
a homonym

B
a synonym

C
an antonym

D
an explanation

C antonym

Explanation:

A homonym is that they are spelled the same but diffrent meaning such as a base ball bat and a bat the mammal.

A synonym is words that have the same meaning

An explanation is when somthing is explained.

So its  C

answer; ///he could not explain why the continents drifted;