M: What are you doing, Mary? W: I am cooking the dinner, John. M: Oh. Look! The Capital Building caught on a big fire today. W: What? How about the people in the building? M: More than 220 people were killed and the building was destroyed. W: It must have taken the fire fighters a long time to put it out. M: Yes, they spent about five hours putting it out. Hm, what a strange smell! W: Oh, I forgot the food cooking on the fire! M: Be quick! Turn the gas off. You should be careful next rime, otherwise you'd have our house on fire!, Question: What advice does John give Mary? (A) He advises her to cook more quickly. (B) He advises her to be careful of the fire. (C) He advises her not to turn the gas off.
(B) He advises her to be careful of the fire.