C- The Evolution of cleidoic egg and internal fertilization would be the greatest of them all..
Explanation-
Most reptiles lay cleidoic eggs with extraembryonic membranes like omnion, chorion, allantois, and yolk sac, Shell around the egg checks dessication. Embryonic membranes enclose the embryo and provide watery environment. Internal fertilization method helps them to survive on land.
Even rest options also helped reptiles a lot in survival.
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