This multi-series line chart displays Sales, Profit, and Expenses across 150 samples, with each metric distinguished by color. Built using React and D3 v7, it renders as SVG, using `d3.scaleLinear` for axes and `d3.line` to generate the three paths. Gridlines, axis labels, and a legend are added via D3’s `append` and `call` methods. The code loads data from a remote CSV using `d3.csv`.