Suppose the marginal propensity to consume equals 0.8 (i.e., c1 = 0.8). Given this information, which of the following events will cause the largest

 Suppose the marginal propensity to consume equals 0.8 (i.e., c1 = 0.8). Given this information, which of the following events will cause the largest increase in output? a) G increases by 200. b) I increases by 150. c) T decreases by 200. d) both a and b. e) none of the above.