In all other groups, the third and first letters are in alphabetical order

Correct Option: B

In all other groups, the third and first letters are in alphabetical order

In all other groups, there is a gap of one letters as in the originaly alphabet between second and fourth letters.

Correct Option: A

In all other groups, there is a gap of one letters as in the originaly alphabet between second and fourth letters.

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

Correct Option: D

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

In all other groups, there is a gap of one letters as in the alphabet between second first and fourth letters.

Correct Option: B

In all other groups, there is a gap of one letters as in the alphabet between second first and fourth letters.

Except OLTF, none of the groups of letters has any vowel.

Correct Option: D

Except OLTF, none of the groups of letters has any vowel.