W: Hi, Dave. Good to see you could come a long way. Come in. M: Wow. Looks like the party is at a high point. W: Yeah. And they're eating all of my food. Oh, I'd like you to meet my sister, Carol. She's visiting on the weekend. M: Oh. Which one is she? W: She's sitting on the sofa over there. M: You mean the woman with long black hair? W: That's right. Let me introduce her to you. You're both so friendly and adventurous. M: And who's the man sitting next to her? Uh, the man wearing the suit jacket? W: Oh, that's Bob, my ballet teacher. M: Ballet teacher! I never knew you could do ballet. W: I started about two months ago. Come on. I'd like you to meet them. M: I'm coming., Question: How does the woman know Bob? (A) He has just been introduced to her. (B) She has taken lessons from him. (C) They have met at a party before.
(B) She has taken lessons from him.