In a coding scheme, 'COLD' is represented as 3, 15, 12, 4 and 'WARM' as 23, 1, 18, 13. What is the code for 'FIRE'?

Answer: A. 6, 9, 18, 5
The letters in 'FIRE' correspond to their positions in the alphabet, similar to the coding of 'COLD' and 'WARM'.