You chose: Arabella should marry Glanville
Throughout the novel, Glanville is quite dedicated to Arabella despite her folly, multiple times commenting or thinking about how difficult or frustrating it is to still admire and/or love her when she has such strange beliefs and points of view. He even makes some degree of progress with her, getting her to eventually give him greater "allowances" for showing his care for her, and continues to try to romance her despite his sister's scorn for Arabella. Based on what we saw throughout the beginning of the novel, it is not out of the question that Glanville might persist and continue to try and win Arabella and eventually perhaps even succeed. Her expectations for romance, while extravagant, could perhaps eventually be fulfilled with sufficient dedication from Glanville.