In an Open Economy with Government and Demand-Determined Output,a Decrease

In an open economy with government and demand-determined output,a decrease in the equilibrium level of national income could be caused by

A) a decrease in taxes at all levels of income.
B) a decrease in the desired level of imports at all levels of income.
C) a decrease in desired consumption at all levels of income.
D) a decrease in the desired level of saving at all levels of income.
E) an increase in government purchases.