Select the option that is related to the sixth letter-cluster in the same way as the first letter-cluster is related to the second letter-cluster and the third letter-cluster is related to the fourth letter-cluster.

HMD : KOE : : BNQ : EPR :: ? : FLV

The correct answer is CJU.

To solve this, we need to find the consistent numerical pattern relating each letter-cluster pair.

Step 1: Analyze the first pair — HMD : KOE

Convert each letter to its alphabetical position and find the difference:

H = 8, K = 11 → Difference = +3
M = 13, O = 15 → Difference = +2
D = 4, E = 5 → Difference = +1

Pattern identified: +3, +2, +1

Step 2: Verify with the second pair — BNQ : EPR

B = 2, E = 5 → Difference = +3 ✓
N = 14, P = 16 → Difference = +2 ✓
Q = 17, R = 18 → Difference = +1 ✓

The same pattern +3, +2, +1 holds. This confirms the rule.

Step 3: Apply the pattern in reverse to find the missing cluster — ? : FLV

Since the unknown cluster is the first in its pair (and FLV is the second), we reverse the operation and subtract:

F = 6 → 6 - 3 = 3 → C
L = 12 → 12 - 2 = 10 → J
V = 22 → 22 - 1 = 21 → U

Step 4: Final Verification — CJU : FLV

C = 3, F = 6 → +3 ✓
J = 10, L = 12 → +2 ✓
U = 21, V = 22 → +1 ✓

The missing letter-cluster is CJU.