This example renders a yellow smiley face using React and D3’s `arc` generator to draw the mouth. The SVG output places two static eye circles and a mouth path on a yellow background circle with a black stroke, all centered within a 960×500 viewport. The code defines the mouth arc with inner and outer radii, then uses React components to structure the SVG elements. The face is purely graphical, with no data input or interactivity, illustrating a simple composition of D3 shape primitives within a React component.