Article: Mrs. Allen's husband died ten years ago when her son and daughter were still in high school. Mr. Allen had left some money, and since Mrs. Allen had managed a bookstore before she was married, she took the money and bought a shop in town. Later she moved the shop out to the shopping center.     She was a pleasant woman; she worked hard and was well-informed about books, and so the bookstore prospered and she was able to hire a friend to help her.     Laura Barnes, Mrs. Allen's friend and assistant, was also a widow. She had some free time and the need for a little extra-money, and so she took the job in the bookstore. She was too clever and friendly, and the two women were well-known in the neighbourhood as "Mrs. A"and "Mrs. B". 
 Question: How many people in all were there in the two women's families?   _  . 
 Options: (A) At least 8 (B) At least 7 (C) At least 6 (D) At least 4
D