Data from the Registrar's Office at Gigantic State University Indicate

Data from the registrar's office at Gigantic State University indicate that over the past 20 years tuition and enrollment have both increased.From this information we can conclude that:

A) higher education is an exception to the law of demand.
B) the supply of education provided by GSU has also increased over the 20-year period.
C) school-age population,incomes,and preferences for education have changed over the 20-year period.
D) GSU's supply curve of education is downsloping.