How many such pairs of letters are there in the word PREAMBLE each of which has as many letters between them in the word as in the English alphabet ?

So, the question essentially asks to find out pairs of letters in the given word "PREAMBLE" which have same number of letter between them as there are in english alphabet. We can start with the first letter initially and then try to check for subsequent letters. Lets take P, now PR have 1 letter between them in english alphabets, here they don't have any letter so this cannot be a possible pair. Lets move on to PE again PE have just 1 letter between them which is not the case in actual english alphabets. Proceeding in a similar manner we can find that words fulfilling the given requirement are
BE, AE. Thus there are only two pair of words which makes option 3 the correct choice.