The logic here is
I + R = 9 + 18 = 27
K + P = 11 + 16 = 27
G + T = 7 + 20 = 27
O + V = 15 + 22 = 37
The sum of letters of IR, KP, GT is 27 except OV.
$$\therefore\ $$OV is the odd one among the given letters.
Hence, the correct answer is Option D
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