Based on the English alphabetical order, three of the following four letter- clusters are alike in a certain way and thus form a group. Which letter-cluster does not belong to the group?

(Note: The odd one out is not based on the number of consonants/vowels or their position in the letter cluster.)

Correct option is B

Step 1: Identify the positions of the letters in each cluster

• A (GMJ)
  G = 7, M = 13, J = 10
  Differences: M - G = 6, J - M = -3

• B (BHF)
  B = 2, H = 8, F = 6
  Differences: H - B = 6, F - H = -2

• C (KQN)
  K = 11, Q = 17, N = 14
  Differences: Q - K = 6, N - Q = -3

• D (RXU)
  R = 18, X = 24, U = 21
  Differences: X - R = 6, U - X = -3

Step 2: Compare patterns

• ACD
  +6-3Clusters , , and have the same pattern:The differences between the letters are followed by .
• B
  +6-2Cluster has a different pattern:The differences are followed by .

Step 3: Identify the odd one out

The odd one out is B (BHF) because its pattern deviates from the consistent +6, -3 pattern found in the other clusters.