Answer:
The character of Lady Bracknell was seen in a way that she represents British aristocracy. Wilde expresses her snobbishness and hypocrisy when Jack refuses Cecily and Algy to marry if Bracknell doesn't let him marry Gwendolen. Lady Bracknell refuses, showing her standing by and embracing the principles of British aristocracy.
I think the answer A. is a good one. As long as you have the evidence to prove it, it would be A.
I love my eyes! I have sectoral heterochromia :) What do you love about yourself?