You chose: Arabella should get married
Without being "cured," Arabella would remain deluded by the romances and acting according to the logic system she has based on the romance plots. She "interpret[s] all events within the narrow expectations of romance" and while these interpretations are "extraordinary," they nevertheless "rely upon the very ordinary intellectual method of empiricism" (Motooka 257). This logical basis is part of the reason why Arabella's beliefs are so dangerous -- they make complete and perfect sense to her because they are rational within the rules of romance. This system of logic leads her into dangerous situations, for example when she assumes that the robbers who approach the carriage are actually attempting to rescue them, and when she climbs into a stranger's carriage after running away from her supposed attacker at home. It is reasonable to extend these foolish behaviors and argue that if she were never cured, she would eventually get herself into a situation where she might be forced to marry -- for example if she goes willingly away with another too-helpful stranger and ends up with her virtue under question -- or where she marries someone with ill intentions who might be pretending to be one of her romantic heroes, like Sir George. The pressure for young women to be married might additionally play into this problem, pushing her towards an unhappy and/or manipulative marriage.