This bubble chart compares cereal manufacturers by plotting each product’s sodium level on the x-axis, its rating on the y-axis, and its calorie count as the bubble radius. Manufacturers are distinguished by color using `d3.scaleOrdinal` with the `d3.schemeSet1` palette. The code loads data from a CSV file, builds the visualization with SVG, and includes legends for both bubble size and color. All axes, scales, and labels are created using standard D3 v7 methods such as `d3.scaleLinear` and `d3.axisBottom`.