The discovery of gold in Australia led thousands to believe that a fortune——

A is made    B would make    C was to be made      D had made

一高速公路项目依法进行招标，按《招标投标法》的规定，开标后允许（）。

A.投标人更改投标书的内容和报价

B.投标人再增加优惠条件

C.评标委员会要求投标人澄清问题

D.评标委员会更改招标文件中说明的评标定标办法