Grant, Inc. had 60,000 shares of treasury stock ($10 par value) at December 31, 2014, which it acquired at $12 per share. On June 4, 2015, Grant issued 30,000 treasury shares to employees who exercised options under Grant's employee stock option plan. The market value per share was $14 at December 31, 2014, $15 at June 4, 2015, and $18 at December 31, 2015. The stock options had been granted for $13 per share. The cost method is used. What is the balance of the treasury stock on Grant's balance sheet at December 31, 2015?

a. $210,000.

b. $270,000.

c. $330,000.

d. $360,000.