Which of the following letter-clusters should replace # and % so that the pattern and relationship followed between the letter-cluster pair on the left side of :: is the same as that on the right side of :: ?
# : XFL :: KSY : %​

Given: # : XFL :: KSY : %​

Logic: 1st and 3rd three letters are increasing + 5 place.

Now, we check each options.

Option (a): # = SAG, % = PID (Not Follow)

S + 5 = X, A + 5 = F, G + 5 = L

K + 5 = P, S + 5 $$\neq$$​ I, Y + 5 = D

Option (b): # = TAG, % = PXD (Not Follow)​

T + 5 $$\neq$$​ X, A + 5 = F, G + 5 = L

K + 5 = P, S + 5 = X, Y + 5 = D

Option (c): # = SAG, % = PXD (Follow)​

S + 5 = X, A + 5 = F, G + 5 = L

K + 5 = P, S + 5 = X, Y + 5 = D

Option (d): # = SAG, % = PXO (Not Follow)​

S + 5 = X, A + 5 = F, G + 5 = L

K + 5 = P, S + 5 = X, Y + 5 $$\neq$$​ O

Thus, correct option is (c).