Answer:
a. Government purchases (G)
a. AD shifts to the left (it decreases)
a. Unemployment increases
Step-by-step explanation:
The military bases are part of the government Hence reducing them is reducing the government spending component of the aggregate demand.
As the government spending decrease and nothing changes the aggregate demand will shift to the left which represent a decrease
As the military bases are closed unemployment will increase as some of the employees will find frictional unemployment until convert into another area of the economy