W: There are so many people in your house. What are they doing? M: We are having a party. I am the host and my wife is the hostess. W: Are they your guests? M: Yes, they are. They are all my friends. W: Who is that man? M: He is Professor Zhang. He is a Chinese teacher. His wife is a teacher, too. Their daughter is a college student. W: Who is that young man? M: He is her boyfriend. He is a young doctor. His name is Karl Black., Question: What are the people in the house doing? (A) They're having dinner. (B) They're having a party. (C) They're watching TV.
(B) They're having a party.