Final answer:
The determinants of aggregate supply are input prices and productivity, which affect the quantity of output produced in the economy and shift the aggregate supply curve accordingly.
Step-by-step explanation:
The determinants of aggregate supply include input prices and productivity, which affect the total quantity of output that firms will produce and sell in the economy. Changes in productivity, such as improvements due to technology that lead to higher levels of productivity, will shift the aggregate supply curve to the right, indicating an increase in total output at each price level. Conversely, increases in input prices, such as higher wages or energy costs, will shift the aggregate supply curve to the left, reflecting a decrease in total output at each price level as higher input costs make production less profitable.
Therefore, the correct answer to the question is: a. include input prices and productivity.