The graph shows costs and projected costs at private four-year colleges, public four-year colleges, and public two-year colleges. Untitled line graph showing costs and projected costs at private 4-year colleges, public 4-year colleges, and public 2-year colleges. X-axis: years 19 + 79 through 2026. Y-axis: costs $0 through $70,000 in increments of $10,000. Which best summarizes the increase in costs at public four-year colleges over the past 30 years? They have increased more than private four-year colleges but less than public two-year colleges. They have increased less than private four-year colleges and public two-year colleges. They have increased more than private four-year colleges and public two-year colleges. They have increased more than public two-year colleges but less than private four-year colleges.