In this question, four groups of letters are given, out of which three are alike in a certain way while one is different. Choose the odd one.

The options are formed by a pair of letters. Each pair has 2 letters such that they have only letter in between.

For example, option A: B d E g, both the pairs (B d) and (E g) has one letter in between: c and f respectively.

Similarly, option B: K m N p, both the pairs (K m) and (N p) has one letter in between: l and o respectively.

Also, option C: P r S u, both the pairs (P r) and (S u) has one letter in between: q and t respectively.

But in option D: T w X z, the first pair (T w) has two letters in between u and v.

So, option D is the odd one out.