A bar chart displays the grades of 100 individual students, with each bar color-coded by letter grade category from A (green) through E (red). The chart uses an ordinal color scale and a linear grade axis from 0 to 100, with student names rotated along the bottom axis. An interactive tooltip shows the student name, numeric grade, and category on hover. The code loads data from a local CSV file using `d3.csv` and builds the visualization with D3’s band and linear scales, axes, and tooltips, rendered as an SVG.