Answer: C. Decrease government spending and increase taxes
Explanation:
The current GDP of this economy is $670 billion and this figure is higher than the $620 billion that the economy should be at.
This means that the economy is in danger of overheating and needs to be adjusted.
To do this one can use option C.
By REDUCING Government Expenditure, government purchases will drop which will aid in reducing the GDP.
By also INCREASING Taxes, the amount of money left for people to consume after they pay their taxes is less so that REDUCES Consumption as well leading to a smaller GDP.
Doing this is known as a CONTRACTIONARY FISCAL POLICY.