---I have tried very hard to find a way out of the trouble, but failed.

---why not ask Frank for help? You see______________.

A．No pains, no gains

B．It’s better to think twice before doing something

C．Two heads are better than one

D．A friend in need is a friend indeed

在任何情况下，卖方所交货物的数量都必须与合同规定的数量相符，否则买方有权拒收货物并提出索赔。 ( )