Norwalk Corporation issued 10,000 shares of $50 par preferred stock at $74 a share. A stock warrant attached to each preferred share allows the holder to buy one share of $10 par common stock for $20. Right after issuance, the preferred stock sells ex-rights for $63 per share. The warrants began selling at $7 per warrant. The amount credited to Common Stock Warrants at issuance of the preferred stock is

a.$0

b.$70,000

c.$74,000

d.$160,000