| List-I | List-II |
| (A) Autonomous items | (I) Net of visible trade |
| (B) Accommodating items | (II) Above the line items |
| (C) Balance of trade | (III) Portfolio investment |
| (D) Capital account | (IV) Below the line items |
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?
\(2, 6, 12, 20, 30, \ ?\)