The correct answer is:
C. Mass is a measure of the matter in an object, while weight is the force of gravity acting on an object.
Mass is a scalar quantity that measures the amount of matter in an object, usually expressed in kilograms or grams, while weight is a vector quantity that measures the gravitational force exerted on that mass, typically expressed in newtons or pounds. Weight depends on both the mass of the object and the gravitational field strength.