Answer:
c. $10,000.
Explanation:
Gross domestic product is the sum total of all goods produced in a country in a given period. Sale of used good are not considered in GDP because the original value of the used item would have been recorded previously as GDP when it was first produced.
Therefore in this scenario the money paid for the house ($250,000) is not considered to be part of GDP since the original value of $90,000 would have been recorded as GDP 10 years ago.
However the commission of $10,000 that the real estate agent collected for his services is considered a contribution to GDP.