An interactive scatter plot displays used car data from the UCI Machine Learning Repository, plotting attributes like selling price, present price, and kilometers driven against each other. Two dropdown menus, implemented with D3's `dropdownMenu`, let the user switch which numerical columns appear on the x- and y-axes. The visualization uses D3 v5's `scaleLinear`, `axisLeft`, and `axisBottom` for the chart, and renders circles in SVG with a staggered 1-second transition animation on dataset changes.