Which of the Following Would Shift Both the Short-Run Aggregate

Multiple Choice

Which of the following would shift both the short-run aggregate supply curve and the long-run aggregate supply curve of iron and steel industry rightward?

A) A decrease in wage rates due to immigration​
B) A decrease in the price of oil due to the discovery of new oil fields
C) A decrease in the size of the labor force due to migration to other countries
D) An increase in corporate taxes by the government
E) An increase in the aggregate price level