Jarel transferred an apartment building held for investment to Ron, an unrelated party, in exchange for an office building. At the time of the exchange, the apartment building had a fair market value of $60,000 and an adjusted basis to Jarel of $50,000. The apartment building was subject to a liability of $15,000, which Ron assumed for legitimate business purposes. The office building had an adjusted basis to Ron of $30,000 and a fair market value of $40,000. In addition, Jarel received $5,000 cash in exchange. What is Jarel's recognized gain on this exchange? A. $15,000 B. $5,000 C. $20,000 D. $10,000