Option D is the correct answer.
What is a proportional relationship?
Proportional relationships are relationships between two variables where their ratios are equivalent. Another way to think about them is that, in a proportional relationship, one variable is always a constant value time the other.
If the relationship between two quantities is a proportional relationship, this relationship can be represented by the graph of a straight line through the origin with a slope equal to the unit rate. Each point (x, y) on the graph, is equal to k, where k is the unit rate. The point (1, k) is a point on the graph.
Therefore, option D is the correct answer.
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