who because if you can replace the word with “he”' or “'she,” use who. If you can replace it with “him” or “her,” use whom. Who should be used to refer to the subject of a sentence.
I hope this helped :)
Who is the correct one
Yes. The punctuation is correct and it is a complete sentence. Nice job!
I would think the answer would be C. But I am not positive
Yes, if something has a positive side on something or someone it would be legal.