To determine which hypothesis the force diagrams best support, we need to assess the context of the diagrams, which are likely illustrating the interactions between magnetic fields or forces.
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Earth is a giant magnet: This hypothesis would be supported if the diagrams show the Earth's magnetic field or suggest that objects are being attracted or repelled in a manner consistent with Earth's magnetic field.
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Opposite poles of a magnet attract: This would be supported if the diagrams display forces acting between magnets indicating attraction between opposite poles (e.g., North and South poles).
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Magnet materials are iron, steel, nickel, and cobalt: This hypothesis would be supported if the diagrams show interaction between magnets and these specific materials.
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Horseshoe-shaped objects tend to possess magnetic properties: This would be supported if the diagrams specifically show horseshoe-shaped magnets and their interactions.
Without the actual diagrams to analyze, the best way to determine which hypothesis is supported is to consider what each potential response would typically represent. If the diagrams depict forces of attraction and suggest interactions typical of magnets, the second response "Opposite poles of a magnet attract" is likely the most accurate choice, as it is a common characteristic of magnetic forces.
If you have specific descriptions of the diagrams, I could give a more accurate answer. But based on general principles, "Opposite poles of a magnet attract" is often the hypothesis that best aligns with force diagrams.