Just like the Campeonato Brasileiro, groups while in the reduced series, including B and C, may be promoted to the top division every year. In the situation of Italy, just the major 3 groups in Serie B are promoted to Serie A (in Brazil, promotion happens for 4 teams in https://xem-b-ng-tr-c-ti-p-k-o-nh88776.blazingblog.com/37607551/what-does-what-is-serie-a-mean