Given, CLARIFY is coded as BKZQHEX
The logic here is
C - 1 = B
L - 1 = L
A - 1 = Z
R - 1 = Q
I - 1 = H
F - 1 = E
Y - 1 = X
Similarly,
O - 1 = N
L - 1 = K
D - 1 = C
$$\therefore\ $$OLD is coded as NKC
Hence, the correct answer is Option B
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