That was so serious a matter that I had no choice but _____ the police.

A．called in

B．calling in

C．call in

D．to call in

A企业为B企业运送一批货物，在到达目的地后B企业未按合同约定交付运费。对此，A企业可以对该批货物予以( )。

A．留置

B．扣押

C．拍卖

D．变卖