Choose the correct order of the given alternative : XWC _ TS20 _ P12 _ L15K _ P _ GS7

The given series can be divided into five groups of four terms, where each group contains three letters and one number.

Each group consists of two consecutive letters, and the number represents the alphabetical position of one of those letters.

In the first group XWC _, the consecutive letters are W and X, whose alphabetical positions are 23 and 24 respectively.

From the given options, the only valid number that matches this rule is 23, which corresponds to W.

Applying the same logic to the remaining groups, the sequence of missing letters must maintain the consecutive-letter pattern along with correct alphabetical position representation.

Only Option D satisfies this condition consistently across all five groups.

Hence, the correct answer is Option D – 23, H, K, O, H.