I would say the answer is D, both B and C. It's definitely not A because it's rather easy to get addicted to drugs and/or alcohol. Those who want to stop can't because it's difficult to.
Answer:
tired & wild
Explanation:
these are the two adjectives because they describe both the cowboys as tired and the horse as wild
An art song is usually for solo voice and is accompanied by solo piano. (Just as a side note, I recommend listening to the Erlking by Schubert if you have time; it's a German art song (lied))