If no fiscal policy changes are made, suppose the current aggregate demand curve will increase horizontally by $1,000 billion and cause inflation. If the marginal propensity to consume is 0.75, federal policymakers could follow Keynesian economics and restrain inflation by:
a) Decreasing government spending by $250 billion.
b) Increasing taxes by $250 billion.
c) Increasing taxes by $750 billion.
d) Decreasing government spending by $750 billion.