Students from outside the province of Markland, who in any given academic year pay twice as much tuition each as do students from Markland, had traditionally accounted for at least two-thirds of the enrollment at Central Markland College. Over the past 10 years academic standards at the college have risen, and the proportion of students who are not Marklanders has dropped to around 40 percent. Which one of the following can be properly inferred from the statements above? ["If the college's per capita revenue from tuition has remained the same, tuition fees have increased over the past 10 years.", 'Over the past 10 years, academic standards at Central Markland College have risen by more than academic standards at any other college in Markland.', 'Over the past 10 years, the number of students from Markland increased and the number of students from outside Markland decreased.', 'If it had not been for the high tuition paid by students from outside Markland, the college could not have improved its academic standards over the past 10 years.']