Answer:
if someone does you a favor, you should take the chance to repay it.
Explanation:
yea
<span>
to establish setting and context</span>
"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?"
The answer is definitely b