If the code for 'CAT' is 12, 15, 18 and the code for 'DOG' is 14, 16, 20, what is the code for 'BIRD'?
Answer: B. 11, 13, 15, 17
The pattern shows that each letter's position in the alphabet is increased by 2 for the code. B(2)+2=4, I(9)+2=11, R(18)+2=20, D(4)+2=6. Thus, the code for BIRD is 11, 13, 15, 17.