Answer:
When an animal dies, the carbon in its body is made available for other organisms to reuse.
Explanation:
This is a perfect example of the law of conservation, which means that all energy in this system (Earth) must be conserved.
Even when an animal dies, decomposers and scavengers are quickly at work to use the carbon (and other nutrients) in its body. This shows how it's a constant cycle!
Why not A: This shows creation, not a reusing cycle.
Why not B: "This rock creates new energy" Um, no. That's just false: rocks don't create energy.
Why not D: This is very wrong. Water evaporating means it turns into water vapor, which demonstrates the law of conservation. D has got it the wrong way around.