Similar to the Campeonato Brasileiro, teams while in the reduce series, which include B and C, may be promoted to the highest division yearly. In the case of Italy, just the best 3 teams in Serie B are promoted to Serie A (in Brazil, promotion comes about for 4 groups https://k-o-nh-c-i32108.bloggazzo.com/36503577/a-simple-key-for-what-is-serie-a-unveiled