The correct option regarding whether the relation is a function is given by:
C. Yes, because one input will always the same output.
What is a proportional relationship?
A proportional relationship is a function in which the output variable is given by the input variable multiplied by a constant of proportionality, that is:
y = kx
In which k is the constant of proportionality.
Since each input is always mapped to only one output(input x, output kx), a proportional relationship is a function.
In this problem, k = 5.99 and option C is correct.
More can be learned about proportional relationships at https://brainly.com/question/10424180
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