Which of the Following Best Describes the Multiplier

Multiple Choice

Which of the following best describes the multiplier?  

A)  It shows the magnified change in planned aggregate spending that arises from a change in output. 
B)  It shows the magnified change in planned aggregate spending that arises from a change in equilibrium output. 
C)  It shows the magnified change in equilibrium output demanded that arises from a change in income. 
D)  It shows the magnified change in equilibrium output demanded that arises from a change in planned aggregate spending.