Question

Each of the following is an example of different modes of communication except

Answer 1

All different types of communication is emailing, texting, and writing a letter.
Hope this help...

Answer 2

Oral communication is known as expressing ideas or information by your mouth, so that is a form of communication

Nonverbal communication is all about reading body gestures, eye movements, just body language. This could be considered communication.

Not sure about Auditory Communication. I know animals rely on it. What we hear and perceive and how we respond COULD be considered auditory communication. 
Written communication is any sort of writing, this one is major

Really, your answer that seems the most sketchy is Auditory, considering I've never really heard of it. I believe the correct answer to this question is C