Answer:
The correct answer is D. not able to be calculated from the information given.
Explanation:
The consumer surplus is the gap between  the maximum price that the consumer is willing to pay and the price the consumer actually pay.
So, Â in this case, Â to get consumer surplus , Â we have to know the price that Mister Smith was willing to pay and the price he actually paid. Â We only have the price he paid and we don't know how much he was willing to pay.
Then , Â we are not able to calculate consumer surplus with the information given. Â