Final answer:
Consumer surplus is the difference between the price a consumer is willing to pay for a product and the actual price they pay.
Step-by-step explanation:
Consumer surplus is the difference between the price a consumer is willing to pay for a product and the actual price they pay. In this case, Amy bought a dog for $150 and received a consumer surplus of $100.
Her willingness to pay is therefore $250 ($150 + $100), which is the amount she would have been willing to pay for the dog if she didn't receive any discount.
So the correct answer is (d) $200.