A adjective is a word that describes/clarifies a noun. So it's pretty much just adding info to a noun.
The boy sat at a broken desk.
10: a TV show or film
11: certain sections of cities
12: praised
13: envy
14: intimidating
15: significant
16: harsh
17: defeated
18: sensed
19: debut
20: I didn’t understand the question with the typo??
I think it is c because impede means delay so you are delaying the writer's creativity. when doing a research paper you are basing off facts and opinion, there is no need for creativity unless you are writing a fictional story.