In a mixed letter coding, if 'CLOUD' is coded as '12345' and 'RAIN' is coded as '6789', what is the code for 'CARN'?

Answer: A. 1268
By analyzing the codes, 'C' is '1', 'A' is '2', 'R' is '6', and 'N' is '8'. Thus, 'CARN' is coded as '1268'.