To answer this question, we need to change each consonant of the word "SEAL" to the next letter of the English alphabet while keeping the vowels unchanged.
The word "SEAL" has two consonants, S and L.
The consonant S comes before T in the English alphabet, while the consonant L comes before M.
So, by changing the consonants, we can form the word "TEAM".
Therefore, only one meaningful word can be formed by using each letter only once in each word after changing each consonant of the word SEAL to the next letter of the English alphabet and keeping the vowels unchanged.
Option A) One - This option is correct because only one meaningful word can be formed.
Option B) Two - This option is incorrect because only one meaningful word can be formed.
Option C) Three - This option is incorrect because only one meaningful word can be formed.
Option D) More than three - This option is incorrect because only one meaningful word can be formed.
The correct answer is A) One.