Select the letter-cluster from among the given options that can replace the question mark (?) in the following series. MA, NZ, OY, PX, ?

QV QW WQ QR

QW

Explanation: MA, NZ, OY, PX, ? The logic followed here is : M → (+1) → N → (+1) → O → (+1) → P → (+1) → Q A → (-1) → Z → (-1) → Y → (-1) → X → (-1) → W So, the letter-cluster that replaces the (?) to complete the series is "QW"