单选题 Speaker A: Could you give me a ride to the conference center? My presentation is in about half an hour.
Speaker B: ______ Have you checked with Bob? He seems to be on his way there about this time.
A. I'm sorry. Perhaps next time.
B. I'm glad to. But it's too late.
C. I'm afraid I am going to the opposite direction.
D. Excuse me, but I'm going to the conference center.