Which of these is a behavioural adaptation?

• A. A hognose snake pretends as dead to trick the predator.
• B. A frog's light coloured belly makes it harder for a predatory fish to see it against sunlight on the water surface.
• C. The scarlet king snake looks very much like the poisonous coral snake.
• D. A treehopper on a leaf or twig resembles a thorn.