A demonstration of pressure could be done best with which of the following? A. a plastic and a pump B. ice in a glass and a thermometer C. a ping pong ball and a cold cupof water D. a wooden box with holes

The answer is A. The pump and the plastic are the only ones that create pressure compared to the other choices. When you exert a force on the pump to a closed object such as plastic, the pressure inside the pump that it gives off makes the plastic full of air. Pressure is defined to be the force per unit area or the stress within a fluid.