Answer
The aggregate demand curve can shift to the left when there is a reduction in consumption spending ( keep in mind this does not include rise in price level) factors such as: increased savings, less investment spending, less government spending, and reduction in net exports can shift the aggregate supply.
Work Step by Step
To solve this simply recognize that aggregate demand will not be SHIFTED by changes in price levels but will be by other factors. Think to yourself what factors? Some are listed above.