In the Above Figure,the Shift in the Demand Curve from D

Multiple Choice

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

A) a decrease in income if pizza is a normal good.
B) a decrease in the price of a sub sandwich, a substitute for pizza.
C) an increase in the price of soda, a complement to pizza.
D) an increase in the number of teenagers, all of whom demand more pizza than do other age groups.
E) new technology that increases the profit from producing pizza.