O'Brien Investment Solutions, Inc. corporate charter indicates that 600,000 common shares are authorized. During the first year of operations, the corporation sold 330,000 common shares and later reacquired 11,700 shares which are held as Treasury stock. What is the amount of outstanding common shares at the end of the year?

• A. 270,000 shares
• B. 318,300 shares
• C. 330,000 shares
• D. 341,700 shares