The best and most correct answer among the choices provided by your question is the third choice or letter C. Direct Variation describes a relationship in which one quantity is a multiple of the other quantity.
Direct Variation. Directly Proportional. A relationship between two variables in which one is a constant multiple of the other. In particular, when one variable changes the other changes in proportion to the first. If b is directly proportional to a, the equation is of the form b = ka (where k is a constant).
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