Let the letters be numbered as A=1, B=2 ..... Z=26
D - A = 4 - 1 = 3
I - D = 9 - 4 = 5
P - I = 16 - 9 = 7
Y - P = 25 - 16 = 9
$$\therefore\ $$P should come in the place of '=' in the given series.
Hence, the correct answer is Option C
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