Due to an error in computing depreciation expense, Prewitt Corporation overstated accumulated depreciation by $20 million as of December 31, 2011. Prewitt has a tax rate of 30%. Prewitt's retained earnings as of December 31, 2011, would be A. overstated by $6 million. B. understated by $14 million. C. understated by $6 million. D. overstated by $14 million.