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.

FLORA : AFLOR : : ALTER : ?

AELRT

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

******************************************

FLORA : AFLOR : : ALTER : ?

The  logic followed here is :

FLORA : AFLOR

= LETTERS IN THE FIRST WORD  ARE WRITTEN  ACCORDING TO THEIR POSITIONAL VALUES IN ENGLISH ALPHABETICAL SERIES TO OBTAIN THE SECOND WORD

F   L   O  R   A 

    ↓   DICTIONARY ORDER

A   F    L   O  R

SIMILARLY

ALTER : ?

A   L   T   E   R

    ↓   DICTIONARY ORDER

A   E    L    R   T