Which of the following retired women is most at risk of age-related memory problems?Betsy is a widow. She helps care for her grandson, who has autism. She spends a lot of time reading about therapies and offering advice on forums. Because of joint problems, she has trouble driving, and is learning to use the bus system. She often watches TV for a couple hours before bed.Hope is married. She attends choir practice and Bible study each week. She likes scrapbooking, making dollhouse miniatures, and sewing for her granddaughters.Magdalena is a widow. She goes to church on Sundays, but spends most of her time alone. She watches television, reads romance novels and inspirational fiction, and often spends a couple hours in the evening paging through photo albums from her childhood.Nan is married. She and her husband enjoy gardening. She takes classes in horticulture and alternative healing, invests in the stock market, and often spends a couple hours a day on Facebook. She is a breast cancer survivor.