Preko 3.5 gola
De Graafschap is very good at home and they are clear favorites here. They have 12-2-3 at home. In that 17 home matches they had scored 42 and conceded 18 goals, which mean average 3,5 goals per match.
Jong Ajax is in terrible form with only one point from last five matches. They have 3-3-11 on the road. In that 17 away games they had scored 17 and conceded 32 goals, which mean average 2,9 goals per match.
I expect something like 3:1, 4:2. Good luck !