- In the Above Figure, the Shift in the Demand Curve

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In the above figure, the shift in the demand curve from D to D1 can be the result of

A) an increase in the price of a sub sandwich, a substitute for pizza.
B) a change in quantity demanded.
C) an increase in the price of pizza.
D) an increase in the price of soda, a complement to pizza.
E) a decrease in income if pizza is a normal good.