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What is the difference between economies of scale and returns to​ scale?A.Economies of scale define how cost changes with output in the short ​run, and returns to scale define how cost changes with output in the long run.B.Economies of scale are present when the​ long-run average cost curve is decreasing​, and returns to scale are present when the​ long-run average cost curve is increasing.C.Economies of scale define how cost changes with​ output, and returns to scale define how output changes with input usage.D.Economies of scale define whether joint output of a single firm is greater than output that could be achieved by two different firms when each produces a single​ product, and returns to scale define how output changes with input usage for a single firm.E.Economies of scale are present when the expansion path is a straight​ line, and returns to scale are present when the expansion path is not a straight line.

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