The answer for this problem is A) 11.1 can someone show me the calcualtions?

A firm has $100 million in current liabilities, $200 million in long-term debt, $300 million in stockholders' equity, and total book assets of $600 million. There are 100 million shares outstanding with a share price of $16. Calculate the debt ratio for the firm.

A. 11.1 percent

B. 66.7 percent

C. 50 percent

D. 33 percent