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Statement C is not correct. Kraits (Bungarus species) have a characteristic tail that is rounded and short, but the subcaudals (scales on the underside of the tail) are divided (in a single row), not undivided. Undivided subcaudals are characteristic of some other snakes like pythons. Statement A is correct: vipers have movable upper jaws (solitary maxillary bones) that allow them to fold their fangs. Statement B is correct: most vipers are viviparous (give birth to live young). Statement D is correct: India is home to multiple cobra species including Naja naja, Naja kaouthia, and others.