The problem requires transforming the letters of the word "TERMINATION" by converting consonants to the previous letter and vowels to the next letter in the English alphabetical series.
Let's process each letter:
This produces the sequence: SFQLJMBSJPM.
Next, arrange these letters in alphabetical order:
BFJJLMMPQSSThe sixth letter from the right end in this arrangement is M.
Which letter replaces the question mark? A, D, G, J, M, ?