Concept:Each cluster is a sequence of letters. We compare the gap between successive letters.
Explanation:In CFI: C to F is +3, F to I is +3.
In BEH: B to E is +3, E to H is +3.
In ADG: A to D is +3, D to G is +3.
In DHL: D to H is +4, H to L is +4.
All options except DHL follow a consistent +3 pattern. DHL follows a +4 pattern, making it different.
Answer:Option B (DHL) is the odd one.
