The answer is D. PO.
The other options, A. XW, B. FG, C. ML, and E. TS, are all pairs of letters that are next to each other on the alphabet. PO is the only option that is not a pair of letters that are next to each other on the alphabet.
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The answer is D. PO.
The other options, A. XW, B. FG, C. ML, and E. TS, are all pairs of letters that are next to each other on the alphabet. PO is the only option that is not a pair of letters that are next to each other on the alphabet.