根据下面的对话内容，从方框内的选项中选出最佳选项，并将答案的标号(A、B、C、D

M: Oh, hi. What is your name again? Since this is only the 2nd day of school, I can't
      remember the students' names yet.
W:   1   I have a hard time remembering names myself.
M: Uh, Karen, right?
W:    2   My mom's name is Karen.
M: Nancy, Okay. I think I heard you were from England.
W: Well, I was born there, but my parents are Americans. I grew up in France.
M:     3  
W: But then we moved here when I was nine.
M:     4  
W: Well, he is a college professor, and he is in Scotland at the moment.
M: How interesting! What does he teach?
W: I have no idea.    5   He teaches chemistry.