If the code for 'CAT' is 12, 15, 18 and the code for 'DOG' is 14, 17, 20, what is the code for 'BAD'?

Answer: A. 10, 12, 14
The pattern shows that each letter is coded by adding 2 to the previous letter's code. 'B' is 10, 'A' is 12, 'D' is 14.