The correct option is A.
What represents the unit rate on a graph?
The points and, where is the unit rate, will always appear on the line representing two quantities that are proportional to each other. The unit rate, in the point, represents the amount of vertical increase for every horizontal increase of unit on the graph.
What is a unit in a graph?
Most often, when we use a coordinate graph, each mark on the axis represents one unit, and we place the origin—the point (0,0) —at the center. However, sometimes, if we have coordinates that are large numbers, we may need to scale the axes differently.
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