Answer:
and they are talking. Bob and Mary are laughingand our teacher is walking around the yard barry and mark are playing basketball and writing about everyone in my diary
"she" would be the pronoun.
You can rewrite this question as "She is your best friend?"
So in that case, "she" would be the subject.
In English, you just switch around "is" and the subject to make a question and make it sound Englishy
PS in Italian (and probably other languages) you would just say "She is your best friend?"
Answer: (C.) She is the antagonist who creates conflict to move the story forward.
Answer: D) It extends about 1600 miles on both sides of the equator.
Explanation: