A Woman Owned a Duplex and Lived in Half and Rented

A woman owned a duplex and lived in half and rented out the other half. She put a "For Rent" sign in the front yard. The first applicant was a black man whom she turned down stating that she didn't rent to men. Under the Fair Housing laws, she

A) is within her rights since she didn't use any discriminatory advertising.
B) is in violation of the Fair Housing laws since she may not discriminate even if only verbally.
C) is guilty of steering.
D) can expect a warning from HUD because she turned down a black.