The Figure Given Below Depicts Macroeconomic Equilibrium in a Closed

The figure given below depicts macroeconomic equilibrium in a closed economy. Assume that the spending multiplier in this economy is 1.5.
Figure 10.5

-Refer to Figure 10.5. Suppose that instead of there being a recessionary gap, the economy is characterized by an equilibrium real GDP level of $900 that exceeds the natural unemployment or potential real GDP level by $600. This so-called expansionary gap can be closed by:

A) increasing planned aggregate expenditures by $400.
B) lowering government purchases by $600.
C) lowering autonomous consumption spending by $400.
D) increasing planned aggregate expenditures by $900.
E) lowering autonomous net exports by $600.