IMO D. It took me 3 min to reach at D.
If you have noticed that we have
;. So we need next part of the sentence not dependent on the introductory part.
In D, we have a clear contrast b/w different slopes and no slopes without music. Let's see what others have:
Most North Carolina ski resorts broadcast music onto the slopes;
skiers can choose among hard rock, soft pop, and “beautiful music” slopes, there are no slopes without music.
(A) skiers can choose among hard rock, soft pop, and “beautiful music” slopes, there are
(B)
because skiers can
choose hard rock, soft pop, or “beautiful music,” there are [there seems many examples and subclauses here separated by a comma. This is sentence framentation.
Incorrect]
(C) however, skiers can choose among hard rock, soft pop, “beautiful music,” and [This is close contender but in the end, it fails to maintain ||sm on adjective (hard, soft,..., no slopes).
Incorrect]
(D) although skiers can choose among hard rock, soft pop, and “beautiful music” slopes, there are [
Correct. We have a contrast introdued by Although and all parts are in sync]
(E) skiers can choose among hard rock, soft pop, “beautiful music” slopes, but [The subclause introduced by BUT is awkward and misleads.
Incorrect]