| List-I (Social Monts) | List-II (Issues) | ||
|---|---|---|---|
| (A) | Chipko Movement | (I) | Agrarian |
| (B) | Trade Union Movement | (II) | Poverty |
| (C) | Naxal Movement | (III) | Ecological |
| (D) | Anti-price Rise Movement | (IV) | Industrial Worker |
What comes next in the series?
\(2, 6, 12, 20, 30, \ ?\)