When comparing two years of enrollment figures, which chart type would best illustrate changes over time?

A line chart is particularly effective for illustrating changes over time because it clearly shows trends and variations in data across a continuous interval, such as years. The individual data points for each year are connected by lines, making it easy to visualize how the enrollment figures have increased or decreased over that period. This connection helps to highlight the overall trajectory of the data, allowing observers to quickly grasp patterns or shifts in enrollment.

While column charts can also depict changes over time, their effectiveness is often limited to comparing discrete values at specific intervals rather than showing continuous trends. Pie charts are designed to convey proportions rather than temporal changes, making them unsuitable for showing enrollment changes year over year. Histograms, although useful for showing the distribution of data within a single year, do not effectively convey changes across multiple time periods. Therefore, a line chart is the most suitable choice for illustrating changes in enrollment figures over time.