A sad face rendered in SVG using React and D3. The visualization shows a yellow circle with black outline as the face, featuring two black circular eyes positioned symmetrically, and a downward-curving mouth arc. The code uses `d3.arc` to generate the mouth path, with React components for the background circle and eyes. D3 v6 and React 17 are loaded via UMD, and the final drawing is produced by rendering SVG elements to the DOM.