There is a frog on a stone. When the stone and the frog are pricked with a pin, the frog jumped off but the stone remained in its place. This shows that

• A. the stone is a non-living thing that cannot feel and the frog is a living thing that can feel.
• B. non-living things can feel.
• C. both the frog and stone are living things.
• D. both the frog and the stone are non-living things.