Final answer:
Technological progress will shift the investment schedule upward and increase the equilibrium level of GDP.
Step-by-step explanation:
Technological progress will shift the investment schedule upward and increase the equilibrium level of GDP. This is represented by option A. When technology improves, it creates more profit opportunities for businesses, leading to increased investment. As a result, the aggregate demand (AD) curve shifts to the right, causing an increase in the equilibrium level of GDP.