This interactive scatterplot visualizes the Auto MPG dataset from the UCI Machine Learning Repository, displaying relationships between different car attributes. Users can choose which two numeric columns to compare using dropdown menus built with the custom `dropdownmenu` function. The D3 v5 code uses `scaleLinear`, `axisBottom`, and `axisLeft` to render the plot, with animated circle transitions via `transition().duration(1000)`. Data is loaded with `csv`, and all numeric fields are converted to numbers before plotting.