Speaker A:Could you give me a ride to the conference center？ My presentation is in about h

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.

请帮忙给出正确答案和分析，谢谢！