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The price of cereal rises. As a result, people have cereal for breakfast on fewer days and eat eggs instead. This behavior is an example of
A.
a decrease in the quantity demanded of cereal because of the substitution effect.
B.
an increase in the quantity demanded of eggs because of the income effect.
C.
a decrease in the quantity supplied of cereal because of the substitution effect.
D.
an increase in the quantity supplied of eggs because of the income effect.