Just like the Campeonato Brasileiro, teams in the reduced series, including B and C, might be promoted to the very best division every year. In the situation of Italy, just the best 3 teams in Serie B are promoted to Serie A (in Brazil, advertising comes about for 4 groups https://charliekorsu.thelateblog.com/38053247/what-is-serie-a-things-to-know-before-you-buy