How many such pairs of letters are there in the word 'DEVELOP' (in both forward and backward directions) each of which has as many letters between them in the word as there are in the English alphabetical order?

Given: DEVELOP

Now, let's check the number of letters between the letters of the given word.

The alphabetical position of the letters of  'DEVELOP' is as follows -

Thus, there are only 2 pairs, 'DE', and 'OP'.

So, the correct answer is (d).