Correct Answer: DJJNETFP

Solution : Given:
BLACKSMITH is coded as CNBELUNKUJ.

Add 1 and 2 alternatively to the place value of the letters of BLACKSMITH, to get the required code –
B + 1 = C; L + 2 = N; A + 1 = B; C + 2 = E; K + 1 = L; S + 2 = U; M + 1 = N; I + 2 = K; T + 1 = U; H + 2 = J
Thus, BLACKSMITH is coded as CNBELUNKUJ.
Similarly, follow the same pattern for CHILDREN –
C + 1 = D; H + 2 = J; I + 1 = J; L + 2 = N; D + 1 = E; R + 2 = T; E + 1 = F; N + 2 = P

Thus, CHILDREN is coded as DJJNETFP. Hence, the second option is correct.