What Characteristics Place These Animals in the Same Group

What characteristics place these animals in the same group?

A) Internal fertilization, cartilaginous skeletons, and four-chambered hearts
B) Shelled eggs, four-chambered hearts, and being endothermic
C) Moist skin, eggs with a jelly-like coating, lungs in their adult forms, and gas exchange through their skin
D) Cartilaginous skeletons, placental development, and internal fertilization
E) Ventral nerve cords and gills in their adult forms

Correct Answer:

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