Concept:Non-contact forces act without physical touch between objects.Explanation:Magnetic force works from a distance, like a magnet pulling iron. It does not require contact. Hence, it is a non-contact force.Frictional force needs surfaces to rub together — it is a contact force.Impact force occurs only when objects collide — also a contact force.So, only magnetic force qualifies as non-contact.Answer:Option A. Magnetic force