Answer:
C. does not buy the dishwasher, and on her purchase she experiences a consumer surplus of $0.
Explanation:
A consumer surplus is the difference between what a consumer pays for an item and what they are willing to pay. In this case Denise is willing to pay $500 and pays $650. The amount she pays is more than she is willing to pay hence her consumer surplus can't be negative. This means it will be 0.