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 ::?
# : QVR :: CHD : %

Given: 

# : QVR :: CHD : %

Logic: 1st and 3rd three letters are + 5 place.
Now, we check each options.
​Option (a): ​# = LQM, % = HMI (Follow)​

L + 5 = Q, Q + 5 = V, M + 5 = R

C + 5 = H, H + 5 = M, D + 5 = I
​Option (b): # = PMM, % = JUY (Not Follow)

P + 5 $$\neq$$​ Q, M + 5 $$\neq$$​ V, M + 5 = R

C + 5 = J, H + 5 = U, D + 5 = Y

​Option (c): # = LJM, % = NHG (Not Follow)​

L + 5 = Q, J + 5 $$\neq$$​ V, M + 5 = R

C + 5 $$\neq$$​ N, H + 5 $$\neq$$​ H, D + 5 $$\neq$$​ G

​Option (d): ​# = GYT, % = NYU (Not Follow)​

G + 5 $$\neq$$​ Q, Y + 5 $$\neq$$​ V, T + 5 $$\neq$$​ R

C + 5 $$\neq$$​ N, H + 5 $$\neq$$​ Y, D + 5 $$\neq$$​ U

Thus, correct option is (a). ​​