Answer:
B. Sandy recognized gain of $400,000.
Explanation:
Sandy transfers land of basis $100,000 to Dolphin Corporation. The land worth is $500,000 which is transferred to Dolphin Corporation in return for all the stocks worth $300,000 and note was executed by Dolphin amounting $200,000. The total consideration of Dolphin Corporation amounts $500,000 which the worth of the land transferred by Sandy. The basis of Land was $100,000. Sandy can recognize a gain of $400,000.