Answer:
A. A decrease in price
Step-by-step explanation:
Aggregate demand is the relationship between the total quantity of goods and services demanded and the price level, other factors remaining constant.
The aggregate demand curve is a graphical representation between total quantity of goods demanded and price level.
A demand curve shows the relationship between price and quantity demanded at a point in time. Demand increases with a decrease in price and it decreases with an increase in price. This follows the law of demand which states that " all things being equal, the higher the price; the lower the quantity demanded, the lower the price; the higher the quantity demanded".
A shift or movement along the aggregate demand curve is caused by price.
The shift or movement could be inward or outward caused by increase or decrease.