This example visualizes the ten highest-crime cities in Massachusetts as a simple column chart, with bars sized proportionally to each city’s crime ratio. The chart uses `d3.csv` to load the 2016 city crime dataset and `d3.scaleLinear` and `d3.scaleBand` for positioning, while rendering bars as SVG `<rect>` elements via React. The visualization omits axes and labels, focusing solely on the relative bar heights to compare crime rates across the selected cities.