— Would you mind my using your car?

—           . Here is the key.

A．Of course

B．Not at all

C．Certainly

D．Sorry

甲在向乙催要赌债无果的情况下，纠集好友把乙挟持至甲家，并给乙家打电话，声称如果再不还钱，就砍掉乙一只手。甲的作为：( )。

A．构成非法拘禁罪

B．构成绑架罪

C．构成非法拘禁罪和绑架罪的想象竞合犯

D．构成敲诈勒索罪