Which of the following factors allowed reptiles to successfully move to land?

Unlike amphibians, reptiles produce amniotic eggs which contain a shell, membranes, and other structures. These protect and nourish the embryo and keep the embryo moist and safe till it grows and is fully developed.

The amniotic egg was one of the evolutionary adaptations that allowed vertebrates to permanently migrate onto land and away from water, which amphibians require to keep their eggs from drying out.