The starting letters are Z, W, T and Q, which stand at positions 26, 23, 20 and 17, decreasing by 3 each time. Each group consists of three consecutive letters in forward alphabetical order. Continuing this rule, the next starting position is 14, corresponding to N, and the next two letters are O and P. Therefore NOP is the only group that respects both the minus three jump and the consecutive letter structure.
Option A:
Option A, OPQ, starts with O at position 15, which is only two positions below Q rather than three. This breaks the consistent backward step of three positions in the starting letters. Although OPQ is internally consecutive, it does not come from the governing position rule, so it is not correct.
Option B:
Option B, RST, moves forward from Q instead of backward, reversing the direction of the pattern. The sequence clearly shows the starting letters moving left in the alphabet by three positions. Because RST represents a forward move, it contradicts this behaviour.
Option C:
Option C, KLM, begins at K, which is position 11, giving a backward jump of 6 from Q rather than 3. This doubles the step size unexpectedly and disrupts the regular decrement. As the series does not indicate any change in the size of the backward jump, KLM cannot be accepted.
Option D:
Option D is correct because N lies exactly three positions before Q and NOP forms a block of three consecutive letters. It preserves both the direction and magnitude of the movement in the first letter, and maintains the same internal structure of the groups. This makes NOP the valid continuation of the letter group series.
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