Final answer:
An increase in the price level does not shift the aggregate supply curve; it results in a movement along the curve. Other factors like labor productivity, business taxes, and oil prices can shift the curve.
Step-by-step explanation:
The aggregate supply curve represents the total supply of goods and services that firms in an economy are willing to produce at a given price level. An increase in labor productivity, a decline in business taxes, and a decline in the price of imported oil would all serve to shift the aggregate supply curve to the right, indicating an increase in supply. However, an increase in the price level affects the quantity supplied, not the aggregate supply curve itself. It's a movement along the curve rather than a shift.
Thus, the correct answer is D) an increase in the price level, which would not shift the aggregate supply curve but rather result in a movement along the curve to a new point representing the quantity of goods and services supplied at a higher price level. Factors such as productivity, taxes, and input costs can shift the curve, while changes in the price level represent movements along an existing aggregate supply curve.