Final answer:
The correct answer is C) Frictional Force. Friction opposes the motion of two objects sliding past each other due to roughness and adhesive forces at the molecular level.
Step-by-step explanation:
The forces that oppose the motion of two objects sliding past each other are the frictional forces. When one object slides over another, friction arises due to the roughness of their surfaces and the adhesive forces between the molecules of the two objects. This contact force is always directed opposite to the direction of motion or attempted motion.
The correct answer to the question is C) Frictional Force. Unlike applied force, normal force, or any fictional 'love force', friction is the relevant force that opposes the sliding motion between two surfaces. The normal force is related to friction in that it impacts the magnitude of frictional force, as the kinetic friction (f_k) or static friction (fs) is the product of the coefficient of kinetic or static friction (Mk or Ms) and the normal force (N).1