Filip could use a line graph because it's great for showing trends over time. He can plot his company's sales on one line and the competitor's sales on another, with the years on the horizontal axis and the sales figures on the vertical axis. This way, he can easily see how their sales have performed relative to each other over the three-year period. Line graphs are particularly effective for this purpose because they highlight changes and trends in data, making it easy for viewers to understand the comparison at a glance.
