Why not answer choice "E"?

@cheynnelee, E isn't necessary to the argument. The argument explains more of why the superior conductors are superior and how they gain respect, so it doesn't matter about how common or uncommon superior conductors are. It's possible that only a few orchestras in the world are led by superior conductors, or it's possible that all of them are. The point is, it doesn't make a difference to the argument. Hope this helps!

Is this a question that can be diagrammed? If so, can someone please diagram!!

We dont have much in the way of sufficient and necessary here, so I would not diagram this question.