John contributes property with a Basis of $20,000 and a value of $40,000 to a three person partnership in return for a partnership interest. The partnership sells the property John contributed five (5) years later for $70,000. How much of the gain on the sale of the property is allocated to John?

a. $30,000 b. $16,666.66 c. $20,000 d. $10,000