If 'RAT' is coded as '789' and 'BAT' is coded as '456', what is the code for 'TAB'?

Answer: A. 654
The code for 'TAB' can be derived from the code for 'BAT', where 'T' corresponds to '6', 'A' to '5', and 'B' to '4', thus 'TAB' is '654'.