In the selection from Dust Tracks on a Road, why does Zora’s grandmother find Zora’s brazenness “unthinkable”?

A. She thinks that Zora's activities are illegal.
B. She thinks that Zora's actions reflect badly on her.
C. She knows that some African Americans have been lynched for minor offenses.
D. She knows that some of her friends will disapprove of Zora's words and behavior.