This interactive line chart visualizes student enrollment counts across university modules, with a dropdown menu to select different module groups. It uses D3.js v4 with SVG rendering, mapping module codes on the x-axis and student numbers on the y-axis. The chart reads from a CSV file and employs a color scale from `d3-scale-chromatic`. When a user selects a new module, the line path transitions smoothly to display the updated values over one second.