A、Three. B、Four. C、Five. D、Six. B

M: What was Professor Calhourn saying about the lecture series on alternative forms of energy when I walked in late? I had trouble with my car again.
W: The first lecture’s tonight. All second and third year students are invited to buffet dinner tonight be fore it starts. Then at 6:30, the speaker will begin her talk on solar energy.
M: Can nonengineering students attend all four weeks of the series?
W: No, they can only go to this week’s lecture. During the next three weeks, the admission will be restricted to engineering students.
M: Oh, then I’m going to try to make it tonight. Can I give you a ride over there?
W: No, but thanks anyway. Wait a minute, didn’t you say that you are having car trouble lately? Let me give you a ride.