Lexi and Allie formed a partnership. Lexi received a 30% interest in partnership capital and profits in exchange for land with a basis of $50,000 and a fair market value of $90,000. Allie received a 70% interest in partnership capital and profits in exchange for $210,000 of cash. Three years after the contribution date, the land contributed by Lexi is sold by the partnership to a third party for $120,000. How much taxable gain will Lexi recognize from the sale?
A. $40,000
B. $70,000
C. $21,000
D. $49,000