The 'King Cobra' is the only snake that builds its nest. Why does he build his nest?

• A. It is a snake-eater and its nest helps it to attract other snakes.
• B. It is a viviparous snake and it needs a nest to give birth to its offspring.
• C. It is the oviparous snake, which lays eggs in the nest and guards the nest when the eggs hatch.
• D. It is a large non-volatile animal, which needs a nest for winter dormancy.