Which of the Following Was an Effect of the Availability

Which of the following was an effect of the availability of air conditioning during the postwar years?

A) major environmental benefits due to how little energy window-units used
B) a decrease in the size of the middle class and in average income
C) an increase in the population of the Sun Belt states
D) widespread economic decline because customers were less likely to enter retail stores
E) an increase in the population of the states in the Great Lakes region