Which of the following helps to break a fall from a second floor window

A．fireman are not well paid or well trained
B．it is not a good idea to smoke in bed or on a couch
C．people should know what to do before a fire breaks out
D．people should always keep the escape path open

A．breathing in smoke might be harmful
B．rope ladders should not be used
C．youngsters often start most home fires
D．jumping out of a window during a fire is dangerous