The investment function intersects the saving schedule at an interest rate of 3 percent and a level of investment of $1.5 trillion a year. If the consumption curve intersects the 45-degree reference line at $3 trillion, then O A. the C + I curve will intersect the 45-degree line at $1.8 trillion. O B. the equilibrium level of real GDP is $3 trillion. O C. the equilibrium level of real GDP is $4.5 trillion. O D. the C + I curve will intersect the 45-degree line at $1.5 trillion