Smiley Face Part V
A smiley face rendered as a reusable React component hierarchy, with a yellow background circle, two black eyes, and a curved mouth drawn using D3’s `arc` generator. The SVG is centered via a `translate` transform, and components accept props for offsets, radii, and stroke width. React (v16.9) manages the DOM, while D3 v5 computes the mouth path. No external data is loaded; all shapes are defined programmatically in JavaScript.