The correct answer is: A. Radioactive isotopes last for less time.
Explanation: Radioactive isotopes are unstable and decay over time into other elements or isotopes, releasing radiation in the process. This decay can happen over a varied range of time scales, from fractions of a second to millions of years. In contrast, stable isotopes do not undergo radioactive decay and remain unchanged indefinitely. The statements B, C, and D are incorrect because stable isotopes do not break down quickly (they do not break down at all), the weight of stable isotopes can vary and is not necessarily heavier, and radioactive isotopes do break down over time.
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