Answer:
A. a shift of the avocado demand curve because only a change in the price of avocados causes a movement along the avocado demand curve.
Step-by-step explanation:
Since consumer income increased, the whole demand curve will shift to the rights. This means that consumers will be willing to purchase more avocados at every price level. A movement along the demand curve results from a change in the price of avocados, which changes the quantity demanded, not the demand curve.