The correct answer is B.
Antonyms are words that have contrasting or opposite meaning. The terms comes from Greek anti ( opposite ) and onym ( name ). There are three types of antonyms:
- complementary, they have no middle ground. Examples: boy-girl, true-false, pass-fail.
- relational, they need a connection between the. Examples: husband-wife, servant-master, borrow-lend,
- graded, they deal with levels of comparison. Examples: young-elderly, wise-foolish, fast-slow.
Many antonyms are built by adding a prefix to a word.
Trivial means of little value or importance.
Imperative means of vital importance, crucial.
They are antonyms because they have contrasting meaning.