The following data has been collected about Keller Company's stockholders' equity accounts:

Common stock $10 par value 20,000 shares authorized and 10,000 shares issued, 9,000 shares outstanding $100,000
Paid-in capital in excess of par value, common stock 50,000
Retained earnings 25,000
Treasury stock 11,500

Assuming the treasury shares were all purchased at the same price, the cost per share of the treasury stock is:

A. $1.15.
B. $1.28.
C. $11.50.
D. $10.50.
E. $10.00.