In a certain code, 'COLD' is coded as '3142', 'WARM' as '2513', and 'BOLD' as '2143'. What is the code for 'MOLD'?

Answer: B. 2143
By analyzing the codes, 'M' is '3', 'O' is '1', 'L' is '4', and 'D' is '2'. Thus, 'MOLD' is coded as '2143'.