Which of the following statements is not true about Rock and Roll?

A、Asarebelliouskindofmusic,RockandRolltouchedarangeofsubjectsthathadlargelybeentaboos.;
B、RockandRollseldomchallengedculturalandpoliticalauthorities.;
C、RockandRollsoonfoundresonanceamongyoungAmericanssinceitsbirth.;
D、SinceRockandRollwasoftenassociatedwithdrugsandsex,parentscondemneditasimmoralandathreattothestandardsofdecency.