The three correct statements about energy and matter in stars are:
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Energy in stars causes the fusion of light elements - This is true, as the immense temperature and pressure in stars facilitate the fusion of elements like hydrogen into helium.
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Some matter is converted into energy within stars - This is true, as per Einstein's equation \(E=mc^2\), where some matter is converted into energy during nuclear fusion processes in stars.
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Energy and matter are both conserved in stars - While individual quantities like energy and mass can change forms, the total accounts for both energy and mass are conserved in the processes occurring within stars.
The other statements are false:
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Only matter is conserved within stars - This is false; energy is also conserved.
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Only energy is conserved within stars - This is false; matter is conserved as well.
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All energy is converted into matter in stars - This is false; energy is not entirely converted into matter in stars; it primarily exists in forms like light and heat.