Aesthetics is refers in a very simple way as the theory of beauty, it is used in arta, in this case, literature. It makes a lot of different questions related to beauty and similar concepts. What makes things beautiful? Which elements contribute to it's beauty and how? You can see that this is a concept that is very difficult to address as philosophers continue debating towards it's elements and characteristics. In this case we are talking of an aesthetic impact, feeling in a powerful way, the beauty of a text. I think the best answer therefore is: D) The way the plot comes full circle is meant to make the reader fell satisfied.
Some of the characteristics of art that we most enjoy are the symmetry and harmony, literature is not the exception, we feel pleaced when this is achieved in a story or a poem. By having a plot that comes full circle this is accomplished, giving the sensation to the reader that he had a round experience, in which nothing was left aside closing the circle.
