Answer:
she felt like a outsider in her new school
Explanation:
outsider means a person who doesn't belong to a family community or proffession game or anything
I think its an Idiom. I don't see like or as. So no simile. I don't see he is something like a marshmallow. - No metaphor. I also don't see a non-human thing doing human things- the grass was dancing in the wind. My answer would be an idiom.
Hope this helps!
The punctuation is correct if that is how how the statement started and ended.
I think that it is A that it allows him to misbehave