A、He believes that it is a good idea to do all of the things that Betty and Bill suggested. B、He agrees with Betty. C、He believe

Baker: Since so many of you have asked me about how to learn a language, 1 thought that it might be useful to take some class time today to discuss it. Betty, you speak several languages, don’t you?
Betty: Yes, I speak Spanish and French.
Baker: And what helped you most in learning those languages?
Betty: What helped me most Well, I studied both languages in high school, and I’ m still studying Spanish here at the university, but I think that travel has probably been the most help to me. You see, I’ve been lucky in that I’ve lived in Europe. Believe me, I didn’t speak very. well before I moved there.
Bill: You’re. right, Betty. After studying a language, practice  is very useful. When you live in a country where the language is spoken, it’s ideal. But, you know, sometimes it’s difficult to make friends in a new place, even when the people are very friendly.
Betty: Yes, I know what you mean. Especially if you don’t speak the language too well. I had some problems when I first moved to Europe.
Baker: And, of course, some people are shy.
Betty: That’s true.
Bill: Professor Baker, whether or not I’m living in a country where the language is spoken, I always go to movies, and whenever I can, I watch TV or listen to the radio in the language I’m trying to learn.
Betty: Me too. And leading is another good way to learn, books are good, but I think that newspapers and magazines arc even better.
Baker: Probably the best way to learn is to combine all of these idea: traveling, talking with people, going to movies, watching TV, listening to the radio, and reading books, newspapers and magazines. What do you think?
Betty: I agree with that, Professor Baker.
Bill: So do I. But I don’t believe that it’s possible to take advantage of practice opportunities  without  some knowledge of the language first.
Betty: Stare, First it’s a good idea to study grammar, vocabulary
Bill: ... and listening, perhaps even reading.
Betty: Then practice is very, very helpful.