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The table below shows the half-lives of four radioactive materials. Radioactive material Half-lives Bismuth-212 60.5 seconds Sodium-24 15 hours Iodine-131 8.07 days Strontium-90 29 years Which of these materials will decay the slowest to one-fourth of its original amount? Bismuth-212 Sodium-24 Iodine-131 Strontium-90