In my opinion it would be stress because it stimulates a energy level to do the work more motivated.
I would say A. Advertisers tend to target their ads at a certain age group, and using different types of music can have a different appeal to a certain age group. If they want certain people paying attention to their ads, they'll most likely use a song from their generation.
I feel like this is what my brain thinks of when it's post to be productive
Felt that-
thanks for the points! :p
If you were to show me the painting i would know
