When the Mexican government sets new environmental standards that require factories to upgrade their

production facilities, investment in Mexico increases and Mexico's aggregate demand

A$.$ decreases because as more investment occurs, less consumption expenditure occurs

B$.$ is unchanged, but the price level falls and quantity of real GDP demanded increases

C$.$ is unchanged, but the price level rises and quantity of real GDP demanded decreases

D$.$ increases. The $AD$ curve shifts rightward.

E$.$ increases and a movement occurs along the $AD$ curve