Concept:Scalar quantities have magnitude only, while vector quantities have both magnitude and direction.
Explanation:Weight is a force, so it is a vector quantity.
Momentum is the product of mass and velocity, so it is a vector.
Displacement has both magnitude and direction, making it a vector.
Potential energy depends only on position and has no direction, so it is a scalar.
Therefore, the scalar quantity among the options is potential energy.
Answer:Option C: potential energy.