In a certain code, 329 means ‘you are bad’, 419 means ‘bad is good’ and 195 means ‘nothing is bad’. ______ represents ‘good’. A. 9 B. 4 C. 1 D. 3

'bad' is in all three sentences and 9 in all three codes, so bad = 9. 'is' is in the second and third, sharing the digit 1, so is = 1. In 'bad is good' = 419, that leaves good = 4.