Select the letter-cluster that can replace the question mark(?) in the following series.

SAT, VEW, YIZ, ? , EUF

BOC

Explanation:

SAT, VEW, YIZ, ? , EUF

The logic followed here is :

S → (+3) → V → (+3) → Y → (+3) → B → (+3) → E

A → (+1) → E → (+1) → I → (+1) → O → (+1) → U

T → (-2) → W → (-2) → Z → (-2) → C → (-2) → F

So, the letter-cluster that replaces the (?) to complete the series is "BOC"