Answer:
b
Step-by-step explanation:
When price level increases, consumers become less wealthy and as a result, they demand less of goods and services. This would lead to a decrease in the quantity demanded.
On the other hand, if price level decreases, consumers become more wealthy and as a result, increase their demand of goods and services. This would lead to an increase in the quantity demanded.
This is why the aggregate demand curve is downward sloping