Just like the Campeonato Brasileiro, teams from the reduced series, including B and C, is often promoted to the top division annually. In the case of Italy, only the major 3 teams in Serie B are promoted to Serie A (in Brazil, advertising takes place for 4 groups in Serie https://alexisixguc.verybigblog.com/36622541/the-fact-about-what-is-serie-a-that-no-one-is-suggesting