Indicate whether each of the following is a topic of microeconomics or macroeconomics:_________a. The impact of higher oil prices on the production of steelb. The increased demand in the last 15 years for exotic dietary supplementsc. The surge in aggregate economic activity that hit much of Asia late in the early 2000sd. The sharp increases in U.S. employment and total output that occurred between 2003 and 2007e. The impact of preservation of wilderness areas on the logging industry and on the price of lumber