This bar chart visualizes the relationship between students’ stress levels and their average grades, grouping data by low, medium, and high stress. The visualization uses D3 v7 to load a CSV file from a GitHub gist, aggregate averages with `d3.rollup`, and render the results as SVG rectangles. It employs `scaleBand` for the categorical x-axis and `scaleLinear` for the y-axis, with axes generated by `d3.axisBottom` and `d3.axisLeft`. The chart’s rotating axis labels and centered annotations clarify the stress-level categories and grade values.