The correct response is:
Her familiarity allows her to invent an otherworldly explanation for events she can easily predict; Nuttel’s unfamiliarity makes him believe this as truth.
This is important because Vera's knowledge of the setting and the circumstances allows her to manipulate Nuttel's perception and create a convincing story that ultimately leads to his shock and horror when she reveals the supposed return of her aunt's family. Nuttel's lack of knowledge prevents him from questioning Vera's tale, making it easier for her to deceive him.