A radial bar chart visualizes the relationship between student grades (A, B, C) and anxiety levels, using concentric rings where each ring represents an anxiety level and arc length encodes the count of students. The chart is built with D3 v7, using the `d3.arc()` API for the radial segments and `d3.scaleOrdinal()` for color encoding by grade. Data is loaded from a CSV file, with grid lines and axis labels indicating anxiety levels. Hovering over a segment reveals a tooltip showing the exact count.