Which of the following sentences is an opinion?

A．Four people in Jiangsu died in early April because of H7N9 bird flu infections.

B．China’s star swimmer Sun Yang won the first prize on April 1st at the National Swimming Championships.

C．People think Peng Liyuan, wife of President Xi Jinping, will draw great attention from people both at home and abroad.

D．It is reported that many college students have volunteered to serve in the 2014.Nanjing YOG.

“这个协议不是要经过公证之后才生效吗”这种商务谈判的发问类型属于（　　　）

A．借助式发问

B．探索式发问

C．强调式发问

D．澄清式发问