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A kindergarten teacher is beginning a new science unit with her class. As part of the unit, the teacher uses a ramp, a toy car, and a ping pong ball to demonstrate a concept. First, the teacher places the ping pong ball at the bottom of the ramp. She places the toy car at the top of the ramp and asks the children to observe what happens when she lets the toy car roll down the ramp and hit the ping pong ball. These materials help the teacher demonstrate which of the following science concepts? O A. motion and stability O B. shape and function of a structure OC. physical properties that describe a material (O D. matter and its interactions