4. The following information pertains to B Company's outstanding stock for 2021: Common stock, $1 par Shares outstanding, 1/1/2021 10,000 2 for 1 stock split, 4/1/2021 10,000 Shares issued, 7/1/2021 5,000 Preferred stock, $100 par, 7% cumulative Shares outstanding, 1/1/2021 4,000 -1- What is the number of shares B should use to calculate 2021 basic earnings per share? A. 20,000. B. 25,000. C. 22,500. D. 27,000.