Navient Corporation had net income of $200,000 and paid dividends of $40,000 to common stockholders and $20,000 to preferred stockholders in 2020. Navient Corporation's common stockholders' equity at the beginning and end of 2020 was $870,000 and $1,130,000, respectively. Navient Corporation's return on common stockholders' equity was a) 19% b) 18%. Oc) 16%. d) 14% e) 12%