Cooney Inc. reported net income of $540,000 during 2014 and paid dividends of $52,000 on common stock. It also has 20,000 shares of 6%, $100 par value preferred stock outstanding. Common stockholders’ equity was $2,400,000 on January 1, 2014, and $3,200,000 on December 31, 2014. The company’s return on common stockholders’ equity for 2014 is: 

a). 17.4% 

b). 15.0% 

c). 13.1% 

d). 19.3%