Which of the following is not a reason why geographers study census results?

a.
to determine which city within a given country has the highest level of income
b.
to determine what languages are spoken within a specific country and where these languages are concentrated
c.
to determine the political ideologies of the individuals who live in a country to find out if the citizens support the government
d.
to determine the level of education that most adults have received within a specific country