Other Things Constant, How Would a Smaller Marginal Propensity to Save

Multiple Choice

Other things constant, how would a smaller marginal propensity to save affect the saving function?  

A)  The smaller the marginal propensity to save, the longer the saving function. 
B)  The smaller the marginal propensity to save, the shorter the saving function. 
C)  The smaller the marginal propensity to save, the flatter the saving function. 
D)  The smaller the marginal propensity to save, the steeper the saving function.