Area Chart
This area chart displays household monthly expenses over time, with a blue line and semi-transparent fill beneath it. The x-axis, labeled "Months," uses a time scale with tick formatting for month abbreviations, while the y-axis, labeled "Expenses," uses a linear scale with formatted tick labels. The chart uses `d3.line` and `d3.area` generators with a basis curve to smooth the path, rendered as SVG, and the data is loaded from a CSV file.