Three of the following letter-clusters are alike in some manner and hence form a group. Which letter- cluster does not belong

Three of the following letter-clusters are alike in some manner and hence form a group. Which letter- cluster does not belong

Three of the following letter-clusters are alike in some manner and hence form a group. Which letter- cluster does not belong to that group?

A.            YNUF

B.            CRYB

C.            ATRE

D.            DSZA

 Sol:

Except option A, pattern follows here is: -11, +7, Opposite letter.

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