At December 31, 2020, UMC's balance sheet reported the following shareholders' equity: Common stock, $1 par Paid-in capital in excess of par Retained earnings Treasury stock (4 million shares at cost) Total shareholders' equity ($ in millions) $200 800 956 (25) $1.931 The Company decided to retire the 4 million treasury shares on December 31, 2020. The effect of the retirement of treasury shares on retained earnings is that Retained earnings decreases. Retained earnings increases. Retained earnings does not change. None of the other answers is correct.