A bar chart displays average exam scores by motivation level, sourced from a CSV file. The visualization uses D3 v7 with SVG rendering, applying `d3.scaleBand` and `d3.scaleLinear` for axes, and `d3.rollups` to group and aggregate data. Bars are colored green via the CSS class `.bar`, with a title and labeled axes. The chart loads data asynchronously via `d3.csv` and renders the plot within an HTML page.