On August 8, 2016, Sam, single, age 62, sold for $210,000 his principal residence, which he has lived in for 10 years, and which had an adjusted basis of $60,000. On November 1, 2016, he purchased a new residence for $80,000. For 2016, Sam should recognize a gain on the sale of his residence of: a. $50,000 b. $25,000 c. $0 d. $130,000 e. None of these choices are correct.