In all other groups, there is a gap of two letters as in the alphabet between second and third letters.

Correct Option: A

In all other groups, there is a gap of two letters as in the alphabet between second and third letters.

Except option (d), sum of all other letters given is equal to 27. And given number represents the possition of lst letters .

Correct Option: D

Except option (d), sum of all other letters given is equal to 27. And given number represents the possition of lst letters .

Except 'PRU', all others having same gap but 'PRU' is not following the same rule.

Correct Option: C

Except 'PRU', all others having same gap but 'PRU' is not following the same rule.

Except (d), all three are same because in those three options first and fourth, second and third are opposite letters.

Correct Option: D

Except (d), all three are same because in those three options first and fourth, second and third are opposite letters.

In all other groups, the second and first letters are three steps ahead of third and second letters, respectively.

Correct Option: D

In all other groups, the second and first letters are three steps ahead of third and second letters, respectively.