The "Income Effect" in the Market for Aspirin Means That

The "income effect" in the market for aspirin means that

A) a decrease in the price of a substitute good like acetaminophen will make aspirin takers feel a little poorer than they were before.
B) aspirin are generally taken by people with higher than average incomes.
C) an increase in the price of aspirin will cause headache sufferers to look for a lower priced remedy.
D) an increase in the price of aspirin will reduce the total purchasing power of aspirin takers, making them able to afford fewer aspirin.