A、By car. B、By bus. C、By subway. D、On foot. C女士问男士他们是开车还是乘坐公共汽车去音乐会，男士回答中提到the subway is the best choice，由此可知，他们可能会乘坐地铁去，故答案为[C]

M: Do you think Andrew is serious about Lisa this time?
W: I don’t know. It’s only been a month and Andrew has never been in a relationship longer than three months. Let’s wait and see.
Q: What can we learn about Andrew?

W: Shall we go to the concert by car or by bus?
M: I have checked the route on the Internet and the subway is the best choice. Both our home and the concert hall are only a few minutes’ walk from the subway stations.
Q: How will the speakers probably go to the concert?