Ventilation is important because it can help prevent a gas fire and can decrease smoke inhalation during a fire.
Firearms should always be in locked cabinets but firearms are not linked to starting fires. The gunpowder in the bullets will explode under extreme heat but there needs to already be a fire to cause that to happen.
Keeping flammable objects away from children is incredibly important and can prevent all types of fires.
Smoking in bed can absolutely lead to fires in the home.
So out of these options the one that could prevent the most fires would be B. Keep flammable objects away from children. However C and A are applicable.
