A D3.js bubble chart correlates average torque, horsepower, and highway MPG for 31 car makes. Each bubble's position encodes horsepower (x-axis) and torque (y-axis), while its radius scales with MPG and its color distinguishes the brand. The visualization includes interactive tooltips showing the make on hover, a legend for MPG sizes, and a categorical color legend, all rendered as SVG with d3.scaleLinear and d3.scaleOrdinal.