A choropleth map of France displays the response rate per university, with red circles sized by percentage using `d3.scaleSqrt`. The map uses `d3.geoConicConformalFrance` from the composite projections library, renders SVG paths via `d3.geoPath`, and overlays city coordinates from a CSV file. Interactive tooltips appear on mouseover, showing each city’s response percentage, with data loaded using `d3.csv` and `topojson`.