"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:
Permeable rock layer
Explanation:
Seems like the only option that truly makes sense.
Answer: C . improving communication skills
Explanation:
D is the best choice. I hope this helps!!