Question ID:PT60 S3 Q24 Passage:Music critic:  How well an underground rock group's recordings sell is no mark of that group's success as an underground group. After all, if a recording sells well, it may be because some of the music on the recording is too trendy to be authentically underground; accordingly, many underground musicians consider it desirable for a recording not to sell well. But weak sales may simply be the result of the group's incompetence. Stem:Which one of the following principles, if valid, most helps to justify the music critic's argument? Correct Answer Choice:BChoice A:If an underground rock group is successful as an underground group, its recordings will sell neither especially well nor especially poorly. Choice B:An underground rock group is unsuccessful as an underground group if it is incompetent or if any of its music is too trendy to be authentically underground, or both. Choice C:Whether an underground group's recordings meet criteria that many underground musicians consider desirable is not a mark of that group's success. Choice D:An underground rock group is successful as an underground group if the group is competent but its recordings nonetheless do not sell well. Choice E:For an underground rock group, competence and the creation of authentically underground music are not in themselves marks of success.