Question

read the list: bad, badly
how are these words related
a. they are both descriptive words
b. they are both adjectives
c. they are antonyms
d. they are both adverbs

Answer 1

They are both descriptive words.

Answer 2

The correct answer is alternative A.

The word bad is an adjective, and badly an adverb. But both have something similar which is being descriptive words, meaning that they show the reader or listener whether the thing was good or bad, or if something was done well or badly.

So even though they aren't the same regarding to gramatics, they are used with the same purpose.