A Reason Why Discretionary Fiscal Policy Might Move the Economy

A reason why discretionary fiscal policy might move the economy away from potential GDP
Instead of toward potential GDP is that

A) government programs are always expansionary.
B) economic forecasts consistently underestimate the impact of fiscal policy.
C) government programs automatically move real GDP away from potential GDP.
D) it is difficult to know whether real GDP is above or below potential GDP.
E) during a recession, politicians prefer increases in government spending over decreasing taxes.