Discussion
Assertion (A): A null result in a seeding trial does not necessarily disprove the physical hypothesis.
Reason (R): The agent may never have reached the supercooled region it was meant to treat.
Answer: B
Both are true and the reason gives the alternative explanation, and this is why tracer verification matters. Distinguishing a failed delivery from a failed hypothesis is a central difficulty. Tracer studies exist precisely to separate the two.
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