Concept:According to the principle of flotation, a floating or sinking body displaces its own weight of the fluid.Explanation:Archimedes’ principle states that the upthrust on a body equals the weight of the fluid displaced.A body sinks until the upthrust balances its weight.This happens when the weight of the displaced fluid equals the weight of the body.So the quantity displaced is weight, not mass, density, or volume.Answer:C. weight