Read this excerpt from The Great Fire.

Two men hauled the cumbersome canvas hose as close to the flames as possible and aimed a stream of water at the burning building. The water hissed and boiled when it struck the burning wood, sending up a vapor of white steam. The firefighters held their position until the fierce heat began to singe the hair on their heads and arms, and their clothes began to smolder. When the pain became unbearable, they staggered back from the flames for a moment's relief, then lunged forward again.

Which detail best supports the idea that firefighters were putting themselves in danger in order to put out the fire?
The firefighters tried to put out the fire with a canvas hose.
Water from the firefighters’ hoses turned to steam.
The firefighters held their positions for as long as possible.
The heat burned the hair on the firefighters’ bodies.