To determine which hypothesis is best supported by the force diagrams you mentioned, I would need to analyze the specifics of those diagrams. However, I can provide some context for the hypotheses listed:
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Earth is a giant magnet. - This hypothesis would be supported if the diagrams show magnetic field lines or indicate that the Earth’s magnetic field influences the forces depicted.
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Opposite poles of a magnet attract. - If the diagrams show forces or interactions between magnets where a north pole and a south pole are attracting each other, this hypothesis would be supported.
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Magnet materials are iron, steel, nickel, and cobalt. - If the diagrams show these materials interacting with a magnet or exhibiting magnetic properties, this would support the hypothesis.
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Horseshoe-shaped objects tend to possess magnetic properties. - If the diagrams feature horseshoe-shaped magnets and their interactions with other magnetic objects, this would support this hypothesis.
Without seeing the diagrams, I suggest you focus on the interactions they depict. If you notice force interactions between magnets with opposite poles, that suggests that "Opposite poles of a magnet attract" might be the best-supported hypothesis.