The first four teams in each group (excluding reserve teams) took part in the play-off.
[1] The 68 participating teams were divided into 5 series each made up of 4 groups in the category, with the exception of Series E , which was only formed by Group XII .
Each series was divided into 4 groups formed by a 1st, a 2nd, a 3rd and a 4th classified from each group, which played a double-round playoff.
The champion of each group obtained the promotion to Second Division B.
17 teams were promoted to Segunda División B.