Baldwin Company had 55,000 shares of common stock outstanding throughout 2009. Th company had outstanding fully vested incentive stock options for 10,000 shares exercisable at $10 that had not been exercised by its executives by the end of 2009. The options were outstanding for the whole year. The average stock price in 2009 was $12. What was the number of shares of stock that should be used in computing diluted earnings per share for 2009?

a. 55,909

b. 56,667

c. 65,000

d. 75,000