I know of no other person in the club who are more kind hearted than they?

1. A Option A: I know of no other person in the club who are more kind hearted than they.
2. B Option B: I know of no other person in the club who are more kind hearted than them.
3. C Option C: I know of no other person in the club whom are more kind hearted than she.
4. D Option D: I know of no other person in the club who is more kind hearted than she.

How we write and check questions