Discussion
Assertion (A): Stratospheric cooling with tropospheric warming points to a greenhouse cause rather than a solar one.
Reason (R): A brighter Sun would warm the whole atmosphere while more greenhouse gas warms below and cools above.
Answer: B
Both are true and the reason gives the discriminating power of the observation, which is exactly what a fingerprint argument requires. A measurement that both explanations predict equally carries no weight in deciding between them.
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