Correct option is D
The multiplier is inversely related to the Marginal Propensity to Save (MPS). An increase in MPS (more saving, less spending) reduces the size of the multiplier, as the formula for the multiplier is

.
The multiplier is inversely related to the Marginal Propensity to Save (MPS). An increase in MPS (more saving, less spending) reduces the size of the multiplier, as the formula for the multiplier is

.