On its 2017 balance sheet, Bummer Books showed $510 million of retained earnings, and exactly that same amount was shown the following year. Assuming that no earnings restatements were issued, which of the following statements is correct? a. If the company lost money in 2017, they must have paid dividends. b. the company must have had zero net income in 2017 c. the company must have paid out half of its earnings as dividends. d. none of the above