This pie chart visualizes the distribution of total Sales, Profit, and Expenses from a CSV dataset containing 160 monthly records. D3 v7 computes the column sums and renders three color-coded slices with category labels, using `d3.pie()` and `d3.arc()` for the SVG paths and `d3.scaleOrdinal` for colors. A legend lists the exact aggregated values for each category.