Sanders, a 62-year-old single individual, sold his principal residence for the net amount of $500,000 after all selling expenses. Sanders bought the house 15 years ago and has occupied it until it sold. On the date of sale, the house had a cost basis of $200,000. Within six months, Sanders purchased a new house for $600,000. What amount of gain should Sanders recognize from the sale of the residence?

$50,000

$0

$175,000

$300,000