This bubble chart shows the correlation between average horsepower, torque, and highway MPG for various car makes. Each circle represents a car manufacturer, with its x-position mapped to horsepower, y-position to torque, and radius scaled to highway MPG using d3.scaleLinear. The visualization uses d3.v7 to render SVG circles with ordinal color encoding by make, alongside interactive tooltips on mouseover. It includes axes with labels, a legend for car makes, and a reference circle legend for MPG values. Data is loaded from a CSV file via d3.csv.