According to the present findings，we can draw a conclusion________so far a large number

of people have died of cholera in this town.[ ]

A．whether  

B．that

C．what 

 D．if

信息发送者对下列哪一项负责？（）

A.确保信息被正确接收和理解

B.促使信息接收者赞同信息的内容

C.尽量减少沟通中的噪声

D.确保信息清晰和完整以便被正确理解