Answer:
Your answer would be A.
Explanation:
A root word is word or word part that can form the basis of new words through the addition of prefixes and suffixes. Therefore, if you understand the meanings of common roots, you can work out the meaning of new words as you find them. In this case, pleasant is the root, the prefix un gives opposite force to this adjective, and then the suffix ly changes the word category from adjective to an adverb.
