Kristen, Who Is White, Unintentionally Offends Caleb, Who Is Black

Kristen, who is White, unintentionally offends Caleb, who is Black, with what he considers a racist remark. What should Kristen say in response?

A) "Don't be so sensitive. I was only joking."
B) "Thanks for the explanation. I'm sorry and see now how that was a hurtful comment."
C) "I didn't mean to be racist. And my intention matters more than your perception."
D) "I've never seen racism in action personally. So you can't expect me to understand."