I need help with this question please

Answer the question on the basis of the following data. All figures are in billions of dollars. Gross Investment $18 National Income 100 Net Exports 2 Personal Income 85 Personal Consumption Expenditures 70 Saving 5 Government Purchases 20 Net Domestic Product 105 Statistical Discrepancy 0 Refer to the data. Disposable income is: ( 1) $83. O 2) $73. ( 3) $75. ( 4) $77