Find the correct option for the blank space . B 6 8 D J 14 17 M N _ _ S

Answer: Option A

In the right side of the question there is a gap of 7 letters between B and J and 6 numbers between 6 and 14. Similarly, there is a gap of 3 letters between J and N. Therefore 3 numbers gap after 14 is 18.
In the left side of the question there is a gap of 8 letters between D and M and 6 numbers between 8 and 17. Similarly, there is a gap of 5 letters between M and S. Therefore 5 numbers gap after 17 is 23.