On July 1, 2013, Robert forms the Yew Corporation. In exchange for 100 percent of the corporation's stock, Robert contributes land with a fair market value of $100,000. Robert acquired the land 5 years ago at the cost of $30,000. At the date of the contribution, the land is subject to a $10,000 mortgage which the corporation assumes. What is the basis of the land to Yew Corporation?

A. $20,000

B. $30,000

C. $90,000

D. $100,000

E. None of the above