Answer: d. $0
Step-by-step explanation:
IRS rules state that if a person sells their principal residence in which they have lived for at least 2 of the last 5 years, they are not to be taxed on up to $250,000 of profit.
Sam had lived in the sold house for 10 years and this was his principal residence so it qualifies for the above provision.
Gain = Selling price - Basis
= 210,000 - 60,000
= $150,000.
This gain is less than the $250,000 allowed so Sam would recognize a gain of $0.