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

Explanation:-

There is gap of one letter between B and D and also there is a gap of one number between 6 and 8.
Similarly, there is a gap of two letters between J and M and gap of two number between 14 and 17.
Again, there is a gap of 7 letters between 6 and 14. As there is a gap of 3 letter between J and M, therefore, the number with a gap of 3 after 14 is 18. Hence, the required numbers are 18 and 23.