The presence of which magnetic feature best explains why a magnet can act at a distance on other magnets or on objects containing certain metals?

The answer is fields

The magnetic forces exerted by the magnet can act at a distance on other magnets or on objects containing certain metals. The magnetic fields showcase the presence of magnetic forces. The magnetic forces arise due to attraction and repulsion of the poles inside the material. Opposite poles attract each other while similar poles repel each other.