Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
WXYZ, YZWX, ABUV, CDST, ?
Answer & explanation
Correct answer: option 2

Explanation:
WXYZ, YZWX, ABUV, CDST, ?
The logic followed here is :
W → (+2) → Y → (+2) → A → (+2) → C → (+2) → E
X → (+2) → Z → (+2) → B → (+2) → D → (+2) → F
Y → (-2) → W → (-2) → U → (-2) → S → (-2) → Q
Z → (-2) → X → (-2) → V → (-2) → T → (-2) → R
So, the letter-cluster that replaces the (?) to complete the series is "EFQR"