Answer:
A) it makes a verb an adjective
Explanation:
It makes the verb an adjective because if you have "fast" and put in "-er" you'd get "faster". Faster would mean going more vigoriously than before, therefore describing the speed of "fast"
B. Adverbs describe verbs (things that are actions). Being tall isn't something the basketball player is doing, it is a description of them as a person.
The astronomical debris was pulled into an orbit around the star.