Don't need thorough explanation, just the answer

Suppose that in the following figure, investment spending increases by $10 million, shifting up the aggregate expenditure line and GDP increases from GDP1 to GDP2. If the MPC is 0.9, then what is the change in GDP? Real aggregate expenditure, AE Y = AE AE2 N AE, 450 0 GDP GDP2 Real GDP, Y O a. $100 million O b. $10 million O c. $9 million O d. $90 million