This visualization shows a static tree diagram categorizing car types by transmission (Automatic, Manual, Semi-Automatic) and number of doors. The code uses d3.hierarchy and d3.tree to compute node positions, then renders SVG paths with d3.linkHorizontal for connections and circles with labels for each node. A hardcoded data object supplies the hierarchy, despite an unused d3.csv call referencing an external car price dataset. Styling is minimal, with steelblue node circles and gray links on a white background.