The increments are not the same, therefore the graph shows misleading data, you could fix it by changing the increments of the x variable on the x axis to 1 so it shows accurate data
45 yard = 1215 cubic feet
Based on that, i think the answer is : C. The Volume of the prisms stays the same, but the number representing the volume increases
Yard and feet are only unit of measurement. Changing this does not affect the actual volume
hope this helps