55. If a corporation has issued a single class of stock, it must be: A. Common Stock. B. Preferred Stock. C. Stock issued at Par-value. D. Cumulative preferred Stock. I 56. Which of the following best describes retained earnings? A. Cash available for dividends. B. The amount initially invested in the business by stockholders. C. Cash available for expansion and growth. D. Income that has been reinvested in the business rather than distributed as dividends to stockholders