This interactive scatter plot visualizes demographic and economic data for California counties, sourced from the UCI Machine Learning Repository’s Auto MPG dataset. Users select a numeric column from a dropdown menu to update the x-axis, while counties are ordered along the y-axis using `d3.scalePoint`. The visualization uses D3 v5, rendering circles as SVG elements with a staggered 2-second transition, employing `scaleLinear`, `axisBottom`, and `axisLeft`. The code also uses `transition().duration(2000).delay()` to animate circle positions smoothly.