Which of the Following Represents a Normative Statement

Which of the following represents a normative statement?

A) A decrease in price leads to an increase in quantity demanded.
B) The study of economics is more important than the study of history.
C) People will buy less butter at $1.50 per pound than they will at $1.00 per pound
D) As an economy develops, the nation's birth rate tends to decrease.
E) As an economy develops, the employment rate in the service sector tends to increase.