An individual contributes three properties to a corporation in a 351 exchange. The first property has a basis of $10000, and fair market value of $50000. The second property has a basis of $100000, and fair market value of $85000. The third property has a basis of $50000, and fair market value of $80000. The third property was pledged as security for a loan of $200000 which the corporation assumes. The individual's stock basis after the transfer is: A. 0 B. 160000 C. 215000 D. 200000