"sound of some music may be disturbing to some people while pleasant for others" , i hope u get the picture, given answer is correct you don't need to get confused.

I can't agree with you. Speak generally, music is not classfied as a noise. I think option A is more reasonable.

I was not talking literally about music, i was taking just an analogy, i recommend you to go through CAP 715 & CAP 716,

i wonder you if you think the same about stress and fatigue as-well, if it is so, i recommend you to go through those publications i mentioned earlier.

Below i've pasted few lines from CAP 716:

"Noise is covered, to a certain extent, in CAP715, in connection with hearing. It can
detrimentally affect human performance interms of damaging hearing, interfering
with speech communication, and affecting concentration and performance on
cognitive tasks. It can also be fatiguing. Effects vary between individuals, and noise
of a certain type and level may be good for one individual but bad for another, in terms
of task performance and errors."

Thanks