This example demonstrates a minimal React application that renders a dropdown menu for selecting a pet. The React component uses the `useState` hook and an `onSelectedValueChange` callback to manage the selected value, while the static SVG markup remains commented out and unused. The code imports React, ReactDOM, and D3 v5 from CDN, with the React app mounted to the `#root` element via `ReactDOM.render`. It shows how D3 can be paired with React for interactive state-driven interfaces, though no data visualization or dynamic rendering is currently active.