In a certain code, 'CAT' is coded as '3120'. How is 'DOG' coded if 'D' is 4, 'O' is 15, and 'G' is 7?

Answer: A. 4157
The code for 'DOG' is formed by concatenating the numerical values of each letter: 4 (D), 15 (O), 7 (G) resulting in '4157'.