This starter example demonstrates how to integrate D3 into a React application, rendering a simple "Hello React!" message on an otherwise blank canvas. The code imports the `arc` function from D3 but does not yet use it, instead focusing on the minimal setup required for React and D3 to coexist. It loads React 16.9.0, ReactDOM, and D3 v5.11.0 via CDN, then uses `ReactDOM.render` to mount the App component into the `#root` div. The example serves as a foundation for future episodes involving more complex D3 visualizations within React components.