In the Prologue, the Chorus A provides a musical interlude.
B provides comic relief.
C offers insight into the characters.
D introduces the story line.

D.

Explanation:

Well, I can asnwer this with common sense without knowing what you watched or read. A Prologue is the very first part of a story, kind of an explanation before the actual story starts. So comic relief wouldn't be right because what would you need relief from when the story hasn't started? Music interlude from what? The only option that makes sense is introduces the story line because that's the purpose of a Prologue in the first place.

the development of trade during the middle age increased to the change given in the agriculture, which gave money, industry and markets a bigger importance in economy. the agriculture production was more than the consumption, which meant the creation of wider markets out of the areas. besides, with the end of multiple wars, the population increased and new trade routes were created.

line a --> main

line b --> young

line c --> atitude