【单选题】

{{I}}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.{{/I}} Why can’t the man see the apartment before 5 pm this afternoon

A、He hasn’t signed the lease yet.
B．He has two appointments this afternoon.
C．The superintendent will not be available until then.
D．His wife has to work.