Correct option is C
Given Word: ADVERSE
According to the alphabetical order there are two pairs-
R-S in forward direction.
S-V in backward direction.

Thus, the correct option is (c) 2
How many such pairs of letters are there in the word ‘ADVERSE’ (in both forward and backward directions) which have as many letters between them in the word as there are in the English alphabetical order?
How many such pairs of letters are there in the word ‘ADVERSE’ (in both forward and backward directions) which have as many letters between them in the word as there are in the English alphabetical order?