From the words or group of words lettered A to D, choose the word or group of words that best completes the sentence below. Our kind teacher only cautioned ...

Answer Details

The correct answer is "off". The sentence suggests that the teacher only gave the bully a warning without taking any further action. The phrasal verb "let off" means to excuse someone from punishment or to give someone a warning without punishing them. Therefore, the correct option is "off".