Answer:
A. Defeating the monster
Step-by-step explanation:
the archetype can be identified when the girl shouts "Don't ever bother me again!"
here, she is fighting the monster away with words. She stands up against the monster (that is the main point, which indicate the answer)
B and C doesn't make sense, cause she doesn't start very poor and become rich with anything at the end of the story, nor does she become corrupted after a period of innocence.