Which letter-cluster will replace the question mark (?) in the following series ? EBF, JGK, OLP, ?

ZWC AXE YVC TQU

TQU

Explanation: Explanation: EBF, JGK, OLP, ? The logic followed here is : E → (+5) → J → (+5) → O → (+5) → T  B → (+5) → G → (+5) → L → (+5) → Q  F → (+5) → K → (+5) → P → (+5) → U    So, the letter-cluster that replaces the (?) to complete the series is "TQU"