Anita sold and delivered an automobile to Marvin, a minor. Marvin, during his minority, returned the automobile to Anita, saying that he disaffirmed the sale. Anita accepted the automobile and said she would return the purchase price to Marvin the next day.
Later in the day, Marvin changed his mind, took the automobile without Anita's knowledge, and sold it to Chris. Anita had not returned the purchase price when Marvin took the car. On what theory, if any, can Anita recover from Marvin? Explain.