Correct Answer - Option 2 : 1, 2, 4, 3
The relationship given here is of School and its inner parts.
First comes School, having different Blocks.
Then the classrooms In the blocks and then the students studying in classes.
The correct order is,
School (1) → Blocks (2) → Classrooms (4) → Students (3).
Hence, the correct answer is "Option 2".