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 ::?
# : QYE :: BHP : %

Given: 

# : QYE :: BHP : %

Logic: 1st and 3rd three letters are + 5, - 3 and + 5 place.
Now, we check each options.
​Option (a): # = RNF, % = WKK (Not Follow)

R + 5 $$\neq$$​ Q, N - 3 $$\neq$$​ Y, F + 5 $$\neq$$​ E

B + 5 $$\neq$$​ W, H - 3 $$\neq$$​ K, P + 5 $$\neq$$​ K

​Option (b): # = LBZ, % = GEU (Follow)​

L + 5 = Q, B - 3 = Y, Z + 5 = E

B + 5 = G, H - 3 = E, P + 5 = U
​Option (c): # = WKK, % = LBZ (Not Follow)​

W + 5 $$\neq$$​ Q, K - 3 $$\neq$$​ Y, K + 5 $$\neq$$​ E

B + 5 $$\neq$$​ L, H - 3 $$\neq$$​ B, P + 5 $$\neq$$​ Z

​Option (d): # = GEU, % = RNF (Not Follow)​

G + 5 $$\neq$$​ Q, E - 3 $$\neq$$​ Y, U + 5 $$\neq$$​ E

B + 5 $$\neq$$ R, H - 3 $$\neq$$​ N, P + 5 $$\neq$$​ F

Thus, correct option is (b). ​​