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Option 3 : Radioactive material is extremely hazardous to humans.
Option 1 is unrelated to the theme of the passage, and is an incorrect assumption. Hence, it is wrong. Option 2 is also scientifically wrong. Option 3 is correct as it is mentioned that the waste is 'regulated by government agencies', and that it has to be isolated, which means that it is hazardous to humans. Option 4 cannot be inferred, as only the methods are mentioned, and we cannot judge the difficulty of the methods mentioned.
Hence, option 3 is correct.
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