A year's tuition at a state university cost €250 in 1972 when the CPI equaled 0.418. The cost of a year's tuition at the same state university cost €3000 in 2000 when the CPI equaled 1.68. The real cost of tuition between 1972 and 2000
A. Increased
B. Decreased
C. Remained constant
D. May have either decreased or increased
E. Cannot be determined