This scatter plot displays relationships between attributes of cars from the UCI Auto MPG dataset. Two dropdown menus let users select which numeric columns to compare on the x- and y-axes, updating the visualization accordingly. Built with D3 v5, the code uses `scaleLinear`, `axisBottom`, and `axisLeft` to render axes, while circles transition smoothly to new positions via `transition().duration()`. The `dropdownMenu` module handles menu creation, and SVG provides the rendering canvas.