Ted King's Basis for His Interest in the Troy Partnership

Ted King's basis for his interest in the Troy Partnership is $24,000. In complete liquidation of his interest, King receives cash of $4,000 and real property (not a Sec. 751 asset) having an FMV of $40,000. Troy's adjusted basis for this realty is $15,000. Section 736 does not apply. King's basis for this realty is

A) $36,000.
B) $15,000.
C) $20,000.
D) $40,000.