单项选择题

Questions 4 to 7 are based on the following conversation.At the end of the conversation,you will be given 20 seconds to answer the questions.Now,listen to the conversation. What is Mary’s problem of living in a family house?()

A.She dislikes the food she eats.
B.She is unable to sleep well.
C.She has no chance to make friends.
D.She finds the rent high.