单项选择题

The author implies that the kinds of music produced by Beiderbecked and Armstrong differ greatly because ______.

A.the attitudes of blacks and whites as reflected in their music are different
B.Beiderbecke's intellectualism held back his development as a musician
C.rebellion acted as a destructive force on Beiderbecke's performance
D.Armstrong was well established as a performer but Beiderbecke was not