You chose: The ending of the novel should be short
In the novel itself, the novel's ending is notably short. The rest of the novel is long, taking long detours into discussing various romances and documenting adventure after adventure that Arabella ends up embroiled in. While Lennox pokes fun at romances for being excessively long, her own novel too takes up a great number of pages. Langbauer recounts the fact that "length is what plagued [Lennox] most in writing her book" and that she wrote "letters to Richardson" to "consult him about the problem: how to fill volumes without being prolix" (Langbauer 72). "According to her critics, it is a problem he didn't help her resolve" -- her novel is very, very long, and yet the ending is quite short (Langbauer 72). By choosing to keep the ending short, you are aligning with the book itself and pushing the novel towards what Lennox stated as one of her goals. Perhaps, though, the more important part of the novel to shorten would be the beginning and middle, not so much the end. After all, if the plot points you hoped for all come true, length doesn't matter that much after all.