On the Aggregate Expenditure Graph, Suppose Autonomous Investment Decreases by $10

Multiple Choice

On the aggregate expenditure graph, suppose autonomous investment decreases by $10 billion.What will be the effect on the aggregate expenditure line?  

A)  The aggregate expenditure line will shift upward by $10 billion. 
B)  The aggregate expenditure line will shift by some multiple. 
C)  The aggregate expenditure line will shift downward by $10 billion. 
D)  The equilibrium level of real GDP demanded will decrease by $10 billion.