This bubble chart shows the correlation between average horsepower, torque, and highway MPG for various car makes. Each circle's position on the x- and y-axes represents horsepower and torque, while its radius encodes highway MPG and its color maps to the car make via a categorical scale built with `d3.scaleOrdinal`. Hovering reveals a tooltip with the make name. The visualization renders as an SVG using `d3.select` and `d3.csv` to load `bubblechart.csv`, with axes from `d3.axisBottom` and `d3.axisLeft`.