Discussion
Assertion (A): Soundness is tested by accelerated methods rather than by observation over time.
Reason (R): The expansion it detects would otherwise take months or years to appear.
Answer: B
Both are true and the reason gives the necessity: nobody can wait years to release a consignment, so boiling or autoclaving compresses the timescale into hours at the cost of some realism. The correlation with field behaviour is accepted rather than exact.
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