You can't travel on this train unless you have a r...

Câu hỏi: You can't travel on this train unless you have a reservation.---> If ________________________________________________

A. you have a reservation, you can't travel on this train.

B. you don't have a reservation, you can't travel on this train.

C. you don't have a reservation, you can travel on this train.

D. you won't have a reservation, you can't travel on this train.