The answer D seems the most reasonable
Within these lines we see simile/metaphor, which is a
literary technique of making a comparison between two things that are generally
not considered similar in an effort to give readers a better understanding of
the topic being discussed. In the lines
we can see that the sound bees and flies make is being compared to the sound a
lute (which is a type of guitar) in order to give readers who might be familiar
with the sound of the lute (and unfamiliar with the sounds of nature) a basis
for comparison in the understanding of how the sound bees and flies
sounded. As such, what these lines are
saying is that the sound flies and bees made while they ate fruit sounded like
the music made by a lute.