When Aggregate Planned Expenditure Is Less Than GDP

Multiple Choice

When aggregate planned expenditure is less than GDP,

A) the economy definitely is at its equilibrium expenditure and firms do not change production.
B) the economy definitely is at its equilibrium expenditure but, even so, firms decrease production.
C) the economy might be at its equilibrium expenditure and, if it is, firms do not change their production.
D) firms increase production until the economy reaches equilibrium expenditure.
E) firms decrease production until the economy reaches equilibrium expenditure.