Much like the Campeonato Brasileiro, teams while in the decreased series, which include B and C, can be promoted to the top division yearly. In the case of Italy, only the prime 3 groups in Serie B are promoted to Serie A (in Brazil, marketing transpires for 4 groups in https://fernandofpeix.actoblog.com/38406916/not-known-facts-about-what-is-serie-a