Is there a document i can read in order to answer this question.
I would like to help you out
It is not A because Nonverbal means that no speech is used.
Its not B because a metaphor is a figure of speech and your seriously asking for an Allownace.
It is not C because a Rhetoric question is one that isn't supposed to be answered.
so it must be D
The correct answer to this question is letter D.