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.

POLE : SROH :: HAIR : ?

KDLU

Pattern followed is :

POLE : SROH

P(16) + 3 = (19)S , O(15) + 3 = (18)R , L(12) + 3 = (15)O , E(5) + 3 = (8)H

Similarly ,

HAIR : ?

H(8) + 3 = (11)K , A(1) + 3 = (4)D , I(9) + 3 = (12)L , R(18) + 3 = (21)U

KDLU , is correct answer .