| List I (Films) | List II (Directors) |
|---|---|
| A. Battleship Potemkin | III. Sergei M. Eisenstein |
| B. Lawrence of Arabia | IV. David Lean |
| C. Wild Strawberries | I. Ingmar Bergman |
| D. High Noon | II. Fred Zinnemann |
Fill in the blank with the correct option.
The teacher believed that the student’s sudden lack of interest in class was an ..........., as he had always been enthusiastic and attentive.
What comes next in the series?
\(2, 6, 12, 20, 30, \ ?\)