What are the five elements of public speech ?（ ）

A、Whoissayingwhattowhomusingwhatmediumwithwhateffects.
B、Whoissayingwhattowhomusingwhatlanguagewithwhateffects.
C、Whoissayingwhattowhomusingwhatmessageswithwhateffects.
D、Whoissayingwhattowhomusingwhatexpressionswithwhateffects.