What causes Atticus to say the following statement to Jem?

“I just want to explain to you that...son, you know you’re a Finch, don’t you?”

A. Atticus’s desire to have the children treat everyone equally and not become affected by Maycomb’s usual disease

B. Aunt Alexandra’s desire to have the Finch children behave respectfully, like a young lady and gentleman

C. Like Aunt Alexandra, Atticus is worried that his children will be a bad reflection upon his family name.

D. Aunt Alexandra’s desire to have the rest of the family live with her and her husband at Finch’s Landing after the trial ends