C is corrent because the return on investment would be computed by dividing net operating income by average invested capital (300,000 / 500,000 = 60%). A is incorrect because return on investment is computed by dividing net operating income by average invested capital. B is incorrect return because on investment is computed by dividing net operation income by average invested capital. D is incorrect because return on investment is computed by dividing net operating income by average invested capital.
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