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.
Art is just like any other primary source as it shows what happened in that time era, what everything looked like, how people dressed and so on
Medium: Any material used to create art.
Proportion: A principle of design that refers to the size relationship of an art work to each other and to the whole.
Technique: The manner in which the artist controls his medium to achieve the desired effect
Answer: Im not positive, but I'm pretty sure the answer is C.
Explanation:
