I'll give you a question, please answer with step-by-step reasoning process. She considered a wig, her hair had begun to what up top?
Options:
- composted
- thin out
- curl
- worn free
- fall out

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Wig is a hair replacement which people with less or no hair wear. Thin out means becoming less in quantity.
The answer: thin out.