The answer is D because when something has a connection it is obviously correlated.
A one-way transmission of messages is how Early theories of communication viewed public speaking.
A series of one-way messages sent from speaker to audience is how public speaking was viewed as per the early theories of communication
The audience joins to participate with the speaker in making shared meaning and understanding.
Well I can't see the letter however there is many things that need to be done before sending a letter. Like signing it or writing who it's getting sent too. Those are the two biggest things to look at before sending a letter. Spelling errors as well, depending on who the letter is being sent to.