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. Why won’t the teachers be available to give the oral interviews at the scheduled time
A．They will be attending another meeting. B．Not all of them will have arrived yet. C．Some of them will be giving a campus tour. D．They will be occupied until that point.