The answer should be D, nonverbal communication. One's willingness to do, say, or think something does not have to be communicated directly. It can be shown through other actions or behaviors.
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The answer is a I think I am not advanced
For this case we have that by definition, a linear function is of the form 
If we have that a and b are linear functions, then they are of the form:
If we multiply them we have: (Applying distributive property)
That is, we get a quadratic function.
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