Which of the Following Propositions Has the Greatest Theoretical Range/level

Which of the following propositions has the greatest theoretical range/level?

A) Canadians who marry when they are older than 30 years old are less likely to divorce.
B) University students who study for more hours get higher grades on examinations.
C) Almost all of the people who rob other people in major Canadian cities are males.
D) During the past century,people in human societies moved toward using mass media on a more frequent basis.
E) Young children who attended day care performed better in high school than children who stayed at home.