为自己加油

Choose the closest paraphrased version for the sentence or italicized part.

Courtesy is often nothing more than a highly developed sense of fair play.（）

A.
Courtesy is not a highly developed sense of fair play.
B.
Courtesy is more than a highly developed sense of fair play.
C.
Courtesy is just a highly developed sense of fair play.
D.
Courtesy is more important than fair play.