On the Aggregate Expenditure Graph, If Autonomous Saving Decreases by $15

Multiple Choice

On the aggregate expenditure graph, if autonomous saving decreases by $15 billion.What will be the effect on the aggregate expenditure line?  

A)  The aggregate expenditure line will shift upward by $15 billion 
B)  The aggregate expenditure line will stay in the same position. 
C)  The aggregate expenditure line will shift downward by $15 billion. 
D)  The aggregate expenditure line will first shift downward, and then it will shift upward by $15 billion.