This interactive scatter plot visualizes the mtcars dataset, letting users select which attribute (mpg, cyl, disp, hp) to plot on each axis. The chart displays circles for each car, with tooltips showing the x-axis value. Using React with D3 v5, the code implements a `Dropdown` component to update state and re-render the SVG. The `scaleLinear` function scales the data, while `AxisBottom`, `AxisLeft`, and `Marks` modules handle the visualization's rendering.