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A farmer is tracking the amount of wheat his land is yielding each year. He finds that the function f(x) = −x2 + 20x + 75 models the crops in pounds per acre over x years.

Find and interpret the average rate of change from year 5 to year 15.
A. The crop yield increased by 150 pounds per acre from year 5 to year 15.
B. The crop yield decreased by 15 pounds per acre from year 5 to year 15.
C. The crop yield decreased by 5 pounds per acre from year 5 to year 15.
D. The crop yield did not change from year 5 to year 15.