Answer: C . CVNSVNZ

Justification:

Clearly, the first letter in the word FORGE remains as it is and the second, third, fourth and fifth letters are respectively moved one, two, three and four steps forward to obtain the corresponding letters of the code.
Applying the same rule to the letters of the word CULPRIT,
C will remain unchange, U will be coded as V, (L as N), (P as S), (R as V), (I as N) and (T as Z).
Thus, the code becomes CVNSCNZ.
Hence the answer is (c).