This visualization uses a D3.js pie chart to show the distribution of car fuel types, with slices representing the proportion of cars using each fuel type. The data is loaded from a CSV file via `d3.csvParse` and grouped with `d3.rollup` to count cars by fuel category. The chart is rendered as SVG using `d3.pie()`, `d3.arc()`, and a color scale from `d3.schemeCategory10`, with labels placed at each arc’s centroid.