Which of the following increases the supply of gasoline?
A. a situation where the quantity of gasoline demanded exceeds the quantity supplied
B. an increase in the price of gasoline
C. a decrease in the price of a resource used to produce gasoline, such as crude oil
D. a decrease in the demand for gas-guzzling, sport utility vehicles
E. an increase in income if gas-guzzling, sport utility vehicles are a normal good.