The current balance sheet of Apex reports total assets of $20 million, total liabilities of $2 million, and stockholders equity of $18 million. Apex is considering several financing possibilities in order to expand operations. Each question based on this data is independent of any others. Assume Apex borrows $2 million to finance its expansion. Apex's debt ratio immediately after the borrowing will be:

a. 0.10

b. 0.33 (rounded)

c. 0.20

d. 0.18