影响期权价格最主要的因素有______。

A．协定价格

B．市场价格

C．标的资产的收益

D．权利期间

--I've been waiting for the phone from my uncle since 5 o'clock.

--________. He is not only a skillful driver but he also knows the road very well.

A．How long has he been away?

B．What's the matter with him?

C．I don't think you should worry about him.

D．I'm afraid there's something wrong with the telephone.