This line chart visualizes the relationship between hours studied and average exam scores, using data from a CSV file on student performance factors. The visualization aggregates the data with `d3.rollups` and `d3.mean` to calculate average scores per hour, then sorts the results. Rendered in SVG, it draws a green line using `d3.line` with circular data points, and employs `d3.scaleLinear` for axes and `d3.axisBottom`/`d3.axisLeft` for tick marks. The chart includes labeled axes for both variables.