I believe the answer is c. An imposter is someone who impersonates/ disguises themselves as someone else
You could either 1. discuss with the teacher(s) on how poorly he treats the classmates and try to find a way to get him to stop
or
You could try and talk to said bully about how is making the class feel with how he has been treating them
We call them as vegetarians
Where the sentences at though?
The pronoun needs to agree with the subject. So clearly "A. We" doesn't work in this sentence... The answer is "B." since the subject is about the author... So the sentence should look like this: "My little brother threw the ball toward Steve and I"