Why not A?

@LizD Paragraph one talks about wanting some level of interest, but not too much complexity that it’s overwhelming. A movie with a plot is interesting, but if the plot is clear and straightforward, it is still easy to follow without being too overwhelming. That’s what B is going for here.

Why not A?

Why not A??

Line 5 says: "A single, pure tone is not that interesting to explore; a measure of intricacy is required to excite human curiosity." I also originally thought A until I reread that line and a fan that makes the same noise would be the same as a pure tone that is not interesting so it can't be the answer!