This bar chart shows the average car price by brand using D3.js within a React application. The code uses `d3.text` to load the CSV file, `d3.csvParse` to parse the data, and `d3.rollup` to calculate the mean `PriceUSD` for each brand. Bars are rendered with `d3.scaleBand` for the x-axis and `d3.scaleLinear` for the y-axis, with axis labels generated via `d3.axisBottom` and `d3.axisLeft`.