Axel, the Owner of Bar-B-Q Café, Announces That He Plans

Axel, the owner of Bar-B-Q Café, announces that he plans to paint its front fluorescent red. Cleo, the owner of Delicate Dress Shop next door, promises to pay Axel $1,000 to use a more conservative color. Axel agrees. Cleo's promise is

A) enforceable, because Axel agreed to refrain from doing something that he was legally entitled to do.
B) enforceable, because Axel would resent Cleo if she never paid.
C) unenforceable, because Axel agreed to refrain from doing some?thing that he was legally entitled to do.
D) unenforceable, because Axel's color choice was offensive to Cleo.