Some small changes. Assuming you want students to choose answer B, I emphasized that both balls are still underwater. Of course, after the ping pong ball rises to the surface, it will displace less water, and so will experience less buoyant force than the solid ball. You are performing product testing for a sports equipment manufacturer. You hold two balls underwater: a solid ball and a hollow ping pong ball with the same diameter. After you release them, the ping pong ball floats to the top, while the solid ball sinks to the bottom. Look at the picture below. When both balls are still underwater, which of the following statements is true? A: The solid ball is experiencing greater buoancy force. B: The buoyancy force on both balls is equal C: The ping pong ball is experiencing greater buoyancy force. D. Unknown: not enough information