A pie chart displays the proportional breakdown of four hardcoded values, with a color legend assigned via a radio button group offering apples or oranges datasets. The visualization renders as an SVG donut using D3 v5's `d3.pie()` and `d3.arc()` generators, with an ordinal color scale mapping categories to distinct hues. The chart draws all arcs at once from a fixed data array, and changing the dataset radio button does not trigger a re-render, as only the initial render function is called.