Manufacturers are now required to make all cigarette lighters child-resistant by equipping them with safety levers. But this change is unlikely to result in a significant reduction in the number of fires caused by children playing with lighters, because children given the opportunity can figure out how to work the safety levers and__.
Lighters that are not child-resistant can be operated by children as young as two years old, unlike child-resistant lighters, most logically completes the argument.