This bubble chart visualizes the correlation between average horsepower, torque, and highway MPG for various car makes. Each circle represents a car make, positioned by its horsepower and torque values, while the circle's size reflects its highway MPG and its color distinguishes the make. The chart uses d3.scaleLinear for axes and bubble size, and d3.scaleOrdinal for color mapping. Interactive tooltips display the make on hover, and a legend shows the MPG scale and color categories. The data is loaded from a CSV file using d3.csv.