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

Answer: A. 8, 5, 1, 20
The letters in 'HEAT' correspond directly to their positions in the alphabet, resulting in the code 8, 5, 1, 20.