Safe is the best option but it could also be wary or even rash as well but it's more likely to be safe and if that's not the correct word choice then it's a safe bet wary is the correct possible alternative hope this helps you out!
In Books IV and V, Jim describes what happens to various of the hired girls. Through this narrative voice, Cather subtly critiques the various definitions of success, as embodied in the fates of the different immigrant women.