Each vowel in the word PRISON is changed to the letter preceding it in the English alphabetical order and each consonant to the letter following it in the English alphabetical order. Which of the following letters will be fourth from the right in the group of letters thus formed?

Given: PRISON 

Each vowel in the word PRISON is changed to the letter preceding it in the English alphabetical order and each consonant to the letter following it in the English alphabetical order.

PRISON: 

P+1=Q, R+1=S, I-1=H, S+1=T, O-1=N, N+1=O

So, H will be fourth from the right in the group of letters thus formed.

Thus, Option D is the correct answer.