This interactive scatter plot displays fuel economy data from the auto-mpg dataset, with dropdown menus that let users select which numeric columns to plot on the X and Y axes. The code uses D3.js v5 scales, axes, and transitions, along with a reusable dropdown menu component. Each car is represented by a semi-transparent green circle that animates to its new position when the menu selection changes, using `transition().duration(2000).delay()` for staggered motion. The visualization updates axes labels and tick marks dynamically based on the selected columns.