I think its C. maybe it might be the drugs, because drugs can make someone 'high' but the also the beauty of the song that overwhelms him. Wheather he is on drugs or not, he feels drowsy and numb. something that makes him recall his past or his lover?
I would pick C because the whole feel of the passage seems to be suspenseful considering the words used like the frosty silence, she drew one last deep breath or nearer he came and nearer.
Answer:
He doesn't drink and party with everyone else and he keeps to himself.
Explanation: