This pie chart visualizes the distribution of passenger classes in the Titanic dataset, showing three categorical slices for Class 1, 2, and 3. The chart uses D3 v7 with an SVG renderer, employing `d3.pie()` and `d3.arc()` to generate the arcs and `d3.rollups()` to aggregate class counts from a CSV. A custom legend displays exact passenger numbers, while axis labels are added despite the circular layout. The color scale maps distinct colors to each class using `d3.scaleOrdinal`.