Mary Traded Furniture Used in Her Business to a Furniture

Mary traded furniture used in her business to a furniture dealer for some new furniture.Mary originally purchased the furniture for $45,000 and it had an adjusted basis of$20,000 at the time of the exchange. The new furniture had a fair market value of$40,000. Mary also gave $4,000 to the dealer in the transaction. What is Mary's adjusted basis in the new furniture after the exchange?

A) $36,000.
B) $24,000.
C) $40,000.
D) $20,000.
E) None of the choices are correct.