I think that the answer is b
Good modifies phone and is a predicate adjective, so a.
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Answer:
When she writes about it, she is able to free herself from the house's grip. She knows that one day she will pack her books and writing materials and leave Mango Street, but she will have left only to come back for the others who cannot get out on their own.
Explanation:
Hopefully this heelped, if not HMU and I will try my best to get you a better answer! :)