If there is a delay of 12 hours or more, you will receive a full 'refund' of the price of your trip. What does the word 'refund' mean in this sentence?
选项：

A:You will get a good discount.;
B:You will get all the money you paid back.;
C:You will get no money back.;
D:You will get 50% of the money you paid back.