You'd better set out an hour earlier for the airport to( ) po

You'd better set out an hour earlier for the airport to( ) possible delays on the way.
A、deal in
B、allow for
C、permit of
D、prepare for
【正确答案】：B
【题目解析】：该题考查词组含义。deal in 经营，买卖；allow for 允许；permit of 许可；prepare for 准备。