This scatter plot visualizes nutritional data for fast food menu items, plotting calories against protein content. Each circle represents a menu item, colored by its food category using a categorical color scale. The visualization includes labeled axes, grid lines, and a clickable legend for category selection. The visualization is built with D3 v5, using `scaleLinear`, `axisLeft`, `axisBottom`, and `scaleOrdinal` APIs. Data is loaded via D3's `csv` function from a McDonald's nutritional dataset (2017). The SVG rendering includes axis tick marks, axis labels, and a title, with legend items that respond to click events.