When government purchases increase with constant tax rate, the logical sequence is:
(B) First, the government runs a deficit when G exceeds T (this is the immediate fiscal impact/accounting reality);
(A) Then, planned aggregate expenditure rises (since G is a component of AE = C + I + G + NX);
(D) This causes the aggregate demand schedule to shift upward;
(C) Finally, through the multiplier effect, the equilibrium income level increases.
This sequence correctly captures the chain of events from fiscal policy change to macroeconomic outcome. -> correct