| List - I | List - II | ||
| (A) | Hostile aggression | (I) | Dominating and bullying others without provocation |
| (B) | Verbal aggression | (II) | Hitting and or fighting |
| (C) | Physical aggression | (III) | Name-calling, swearing |
| (D) | Proactive aggression | (IV) | Directed at inflicting injury to others |
What comes next in the series?
\(2, 6, 12, 20, 30, \ ?\)