This example renders a yellow smiley face using React and D3’s `arc` generator for the mouth and one eye, while the other eye is omitted, leaving the face halfway complete. The face is drawn as an SVG circle with a thick black stroke, centered at a fixed width and height. The mouth and eye arcs are positioned relative to the center using D3’s `arc` with specified inner and outer radii and angles. The code uses `d3.arc`, `ReactDOM.render`, and SVG elements, with fixed numeric constants for layout.