On July 1, 2013, Bertram Bryant acquired a 30 percent interest in Windward Company, a partnership, by contributing property with an adjusted basis of $5,000 and a fair market value of $12,000. The property was subject to a mortgage of $8,000, which was assumed by Windward. What is Bryant's basis of his interest in Windward?
a. $0
b. $4,000
c. $5,000
d. $6,400