Answer:
"Upon its head . . . sat the hideous beast . . . I had walled the monster up within the tomb!"
A metonymy is when you use a concept to denote a different concept that is close to meaning. It's when you say Hollywood makes great movies, but it's not really hollywood, it's the studios who exist in hollywood. Apply this logic to your lines since you didn't provide them here.
The answer is C.
A is during the exposition.
B is during the resolution.
D is the climax, right after the rising action.
