A、The telephone. B、The light bulb. C、The microwave oven. A男士认为电话的发明最有帮助：I think the most helpful invention is the telephone．

M: Do you want to go to the movies, Emily?
W: Sure, this video is boring.
M: When do you want to go?
W: Let’s go at six o’clock.
Q: What is Emily doing?

W: What do you think is the most helpful invention?
M: I think the most helpful invention is the telephone.
W: Why is that?
M: Well, people can talk with each other in far-away places.
Q: What invention is the most helpful?