This area chart shows the average exam score for each number of hours studied, using data from a CSV file of student performance factors. The visualization aggregates the raw data with `d3.rollups`, computing the mean score per hour, and then renders an orange, semi-transparent filled area with a dark orange stroke using D3's `d3.area` and `d3.line` generators. Axis scales are set with `d3.scaleLinear` and rendered via `d3.axisBottom` and `d3.axisLeft`, producing an SVG output.