Answer:
3) AD shifts right and output would decrease.
Step-by-step explanation:
Aggregate demand (AD) is the total number of goods demanded in an economy in a period of time.
If Congress decides to cut the National debt (or accumulated debt of the government) by half, this will make interest rates lower and will encourage investment from the private sector.
The shifting to the right occurs when these components; consumption spending and investment spending increases due to cut in National debt.
The AD curve will shift back to the left as these components decreases.