Answer:
if we sell our house
Explanation:
Adverb clause is a dependent clause which functions as an adverb, i.e. it modifies an adjective, a verb, or another adverb.
There are different types of adverb clauses such as adverb clause of time, cause, condition, or manner.
This sentence includes adverb clause of condition that is if we sell our house.
A and E both support the point.
"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?"
