A possible topic may be:
Is civility and propriety in Elizabeth Bennet a matter of pride or prejudice?
In respect of civility, Elizabeth has significant interactions with several characters. Consider each of them.
Jane Bennet, as her sister, is treated with love and respect. But Jane contrasts with Elizabeth in treating all others with forbearance, empathy and kindness, rather than mere civility and propriety. The angelic Jane lacks pride or prejudice.
Mr Whikham is idolised, at first, by the more than civil Elizabeth. In her gullibility, prejudice reigns. Whikham is apparently the essence of civility and propriety, unlike Darcy!
Mr. Darcy, who values greatly propriety, is treated by Elizabeth with a civility that is cold and judgmental - full of prejudice. In contrast to Jane, Elizabeth takes pride in her supposed moral superiority to Darcy.
Charlotte Lucas marries the uninspiring Mr Collins. While acting with civility to them both, Elizabeth is too proud to really understand the nature and circumstances of her close friend's marriage. Elizabeth lacks warmth.
Lady Catherine de Bourgh is pompous and demanding. Elizabeth remains civil but her pride and prejudice impels her to behave defensively and aggressively at the same time. Sister Jane would put the best construction on everything.
Lydia Bennet is a romantic muddle-head but Elizabeth's pride impels her to judge harshly, despite Lydia's very different social and intellectual situation. Elizabeth battles to maintain civility in a family that falls short of her own proud standards of propriety.
Mr Bennet is detached wisdom personified. Elizabeth struggles to reconcile respect for her father and family with the disparaging pride of the superior Mr Darcy.
You may wish look to elaborate on this material and include other characters to develop your essay. And remember: the novel is a comedy.