the both questions the answer is E but i need explanation

2. Jack gave up business land (AB $30,000; FMV $50,000) and marketable securities (AB $10,000) in exchange for other business land (FMV $75,000). What is Jack's recognized gain/loss on the exchange? a. No gain or loss is recognized since no boot was received. b. $20,000 gain recognized c. $35,000 gain recognized d. $15,000 gain recognized e. None of the above 3. Stan's building (AB $490,000) is condemned. He receives condemnation proceeds of $600,000 and purchases a new qualifying building for $510,000. What is the recognized gain and basis of the new property, respectively? a. $110,000; $490,000 b. $ 90,000; $600,000 c. $110,000; $510,000 d. $ 90,000, $490,000 e. None of the above 4. David exchanges business land (Cost $32.000) for other business land (FMV $70,000) and marketable