The word most nearly the opposite to AUGMENT is:a. Peace b. Diminish c. Quarrel d. Supplement

The word "augment" means to make something greater by adding to it; to increase. Therefore, the word most nearly the opposite to "augment" would be a word that means to make something smaller or to decrease it.

Looking at the options:

a. Peace - This is not related to the concept of increasing or decreasing something. b. Diminish - This word means to make or become less, which is the opposite of augment. c. Quarrel - This is not related to the concept of increasing or decreasing something. d. Supplement - This word is actually a synonym of augment, as it also means to add to something.

So, the word most nearly the opposite to "augment" is "diminish".