Answer:
Option B
Explanation:
The maximum given rank for a boy from one side of the queue is 9. So, we first consider a queue of 9 boys.
1 2 3 4 5 6 7 8 9
S A
But in this queue, there is even number of boys between Shikhar and Arun and as such, the middle position of Nikhil cannot be ascertained.
Now, consider an arrangement of 10 boys in a queue.
1 2 3 4 5 6 7 8 9 10
S N A
Hence, required number of students = 10.