45 line 20 Consumption expenditure (trillions of 20050 dollars) 16 12 B 1.2 0 12 16 20 24 Disposable income (trillions of 2005 dollars) In the above figure, a change in autonomous consumption to $4 trillion with no change to the MPC would cause the consumption function to Select one: O a. shift upward. b. shift downward. c. become flatter. d. become steeper