Final Answer:
The cutoff half-life for decay in storage, indicating the time it takes for a substance to lose half of its radioactivity, is typically considered to be around 50 years. Option B (50 years) is the answer.
Step-by-step explanation:
The concept of half-life is crucial in understanding the decay of radioactive substances. In the context of storage, the cutoff half-life is a measure of the time it takes for a radioactive material to reach a level where it is considered safe or no longer poses a significant risk. A cutoff half-life of 50 years is often used as a general benchmark, representing a reasonable timeframe for managing and mitigating potential hazards associated with radioactive decay. This choice balances the practical considerations of storage and disposal with the radioactive substance's decay characteristics.
Option B (50 years) is the answer.