Answer: a: increase government spending and reduce taxes
Step-by-step explanation:
Aggregate Demand is a measure of just how much goods people in the economy demanded in a certain period.
That means it can be calculated as where,
AD = C + I + G + ( X - M )
Where,
C is Consumption
I is Investment
G is Government Spending
(X - M) is net exports.
If the Government increases it's spending, you can see that from the formula, AD will rise as well because Government Spending is one of it's components.
Reducing Taxes also imparts this Formula because less taxes equates to more disposable income which equates to more Consumption. A higher consumption as you can see, leads to a higher Aggregate Demand.