A grouped bar chart shows the correlation between education level and the perceived politeness of police contact, based on survey data from respondents. The chart displays the share of respondents (as a percentage) per education level for each of five Likert-scale responses, from “Helemaal mee oneens” to “Helemaal mee eens.” The code uses D3 v5 with SVG rendering, reading a CSV file, and applies scales such as `d3.scaleBand` and `d3.scaleLinear` for layout. A legend allows clicking on a category to filter the bars via a custom update function.