6. Assume the following is the stockholders' equity section of the 2016 Merck & Co., Inc., balance sheet. Stockholders' Equity ($ millions) 2016 Common stock, one cent par value; Authorized-5,400,000,000 shares; Issued-2,976,223,337 shares-2016 $ 29.8 Other paid-in capital 6,900.0 Retained earnings... 37,918.9 Accumulated other comprehensive income 52.3 44,901.0 Less treasury stock, at cost: 794,299,347 shares-2016. 26.984.4 Total stockholders' equity... $17.916.6 How many common shares are outstanding as of December 31, 2016? a. 5,400,000,000 b. 2,976,223,337 c. 3,770,552,684 d. 2,181,923,990