If you read each of these, or speak them, there is only one that suits the sentence correctly.
Go with the third one. Couldn't seems to fit pretty well there.
Workers lives were devalued over the protection of goods.
Workers often lived in horrible urban conditions with few legal protections, long work hours, and in humane factory conditions.
Gray wolves disappeared from the Yellow Stone National Park, because when the National Park was built during the early 1800s, 1872 to be exact, Gray wolves were not protected by the park itself, there were no laws to protect these species, which is why hunters, who come across the park, hunts these gray wolves until their population decreased.
-Hope this helps
Lucy really shouldn’t ride her school on the clean floor.
