Select the option that is related to the third letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster.

GROW : IMRS :: PEST : ?

RZVP

A   B   C    D   E    F   G    H    I    J    K    L   M

 ↓    ↓    ↓    ↓    ↓     ↓   ↓    ↓     ↓   ↓    ↓    ↓    ↓

 Z   Y    X   W   V    U   T    S    R   Q   P    O   N

26  25  24  23  22  21  20  19  18  17  16  15  14

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THE LOGIC FOLLOWED HERE IS :

G → (+2 ) → I

R → (-5 ) → M

O → (+3 ) → R

W → (-4 ) → S

 SIMILARLY

P → (+2 ) → R

E → (-5 ) → Z

S → (+3 ) → V

T → (-4 ) → P