This example demonstrates a minimal D3 version 7 starter template that renders the text "Hello D3 version 7" centered on a blank page using the `d3.select()` API. The page loads D3 from a CDN and runs a JavaScript bundle that calls `select('body').text(...)`. It also includes an unused dropdown menu component built with React, referencing sensor data options, though it does not affect the displayed visualization. The primary rendering relies solely on D3’s DOM selection and text manipulation.