Most North Carolina ski resorts broadcast music onto the

Still in a dilemma whether to chose D or E.

I guess will take D because Although skiers can choose among various slopes, there are no slopes without music. A but before there would have been nice

A and B are out because of run-ons - we need a conjunction after "slopes" and before "there"

C says skiers can choose between music and not slopes !

In E the last fragment is awkward - but no slopes without music

that leaves D as the answer and the meaning makes sense too.

The 2nd part of the question is referring to slopes with music and slopes without music. Skiers have the option of choosing slopes with music however they don't have the option of choosing one with out music. Hence D :-D

(A) skiers can choose among hard rock, soft pop, and “beautiful music” slopes, there are So? Improper conclusion
(B) because skiers can choose hard rock, soft pop, or “beautiful music,” there are - Causal effect is not proper
(C) however, skiers can choose among hard rock, soft pop, “beautiful music,” and - Categorizing slopes with no music along with various music options
(D) although skiers can choose among hard rock, soft pop, and “beautiful music” slopes, there are - :-D
(E) skiers can choose among hard rock, soft pop, “beautiful music” slopes, but - does not refer to the skier's option