— If we take a plane, we'll of course have arrived in London by the next weekend.

— Don't be too sure. We should _____ the weather factor. What shall we do if it is foggy? [ ]

A. look for

B. allow for

C. prepare for

D. wait for

定金的罚则是给付定金的一方不履行约定的债务的，无权要求返还定金；收受定金的一方不履行约定的债务的，应当双倍返还定金。因不可抗力、意外事件致使主合同不能履行的，适用定金罚则。( )