Speaker A: Could I get a ride with you to the concert tonight？ Speaker B:I cant go,______.

Speaker A: Could I get a ride with you to the concert tonight？ Speaker B:I cant go,______. I think shes leaving around 7:

A．but you might ask Betty

B．neither can Betty

C．and Betty is going to

D．but I don"t know if Betty will go

请帮忙给出正确答案和分析，谢谢！