Final answer:
The statement that is not true of a demand curve is that d. it reflects sellers' reservation prices; this would be true for the supply curve instead. Demand curves have a negative slope and adhere to the law of demand.
Step-by-step explanation:
The statement that is not true of a demand curve is d. it reflects sellers' reservation prices. Demand curves graphically represent the relationship between price and the quantity demanded by consumers, not sellers. A demand curve typically has a negative slope, meaning it slopes downward from left to right, which reflects the law of demand: higher prices lead to lower quantity demanded, and lower prices lead to higher quantity demanded. Sellers' reservation prices would be reflected in the supply curve, not the demand curve.