Explanation:

To find the pairs of letters in the word "SEQUENTIAL" that have as many letters between them as are in the alphabet, we need to consider the distance between the letters in the word and compare it to the number of letters in the alphabet.

Step 1: Counting the Letters in the Word
Counting the letters in the word "SEQUENTIAL", we find that it has 10 letters.

Step 2: Counting the Letters in the Alphabet
The English alphabet consists of 26 letters.

Step 3: Finding the Pairs of Letters
To find the pairs of letters that have as many letters between them as are in the alphabet, we need to consider the distance between the letters in the word.

By examining the word "SEQUENTIAL", we can identify four pairs of letters that have as many letters between them as are in the alphabet:

1. S and U: There are three letters (T, R, and Q) between them, which is the same number as the letters in the alphabet.
2. S and L: There are 11 letters (E, Q, U, I, N, T, I, A, L) between them, which is not the same number as the letters in the alphabet.
3. U and I: There are 10 letters (E, Q, U, E, N, T, I, A, L) between them, which is not the same number as the letters in the alphabet.
4. L and E: There are 12 letters (Q, U, I, N, T, I, A, L, E) between them, which is not the same number as the letters in the alphabet.

Therefore, there is only one pair of letters (S and U) in the word "SEQUENTIAL" that have as many letters between them as are in the alphabet.

Conclusion:
The correct answer is option B, which states that there are four pairs of letters in the word "SEQUENTIAL" that have as many letters between them as are in the alphabet.