Answer the question on the basis of the following marginal utility data for products X and Y. Assume that the prices of X and Y are $4 and $2, respectively, and that the consumer's income is $18. 
Which of the following represents the demand schedule for X?
Definitions:
Demand Curve
A graphical representation showing the relationship between the price of a good or service and the quantity demanded at various prices.
Quantity Demanded
The specific amount of a good or service consumers are willing to buy at a given price point, holding all else constant.
Quantity Supplied
The total amount of a good that producers are willing to sell at a given price over a specific time period.
Shortage
A situation in which demand for a good or service exceeds the available supply at a specific price.
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