Final answer:
A 10-m fall onto concrete is far more dangerous than a 10-m fall onto water because water provides a cushioning effect, reducing the impact force.
Step-by-step explanation:
The correct answer is d) Water provides a cushioning effect. When you fall onto concrete, the impact force is directly transmitted to your body, resulting in a higher risk of injury. On the other hand, water provides a cushioning effect when you fall onto it, which reduces the impact force and makes it less dangerous.