Option 1: 50 -> At income 50, consumption exceeds income, resulting in dissaving (negative APS).
Option 2: 100 -> At income 100, savings is zero, making APS = 0 (break-even point).
Option 3: 200 -> At income 200, positive savings exist, so APS is positive.
Option 4: 0 -> At income 0, autonomous consumption causes dissaving (negative APS).
Hence, Option 2: 100 -> APS (Average Propensity to Save) = Savings/Income. At income level 100, this represents the break-even point where consumption exactly equals income, meaning savings = 0. Therefore, APS = 0/100 = 0. Below this income level, households dissave (negative APS), and above it, they save (positive APS). -> correct