Discussion
Assertion (A): A long spin-up is needed before a coupled model experiment can begin.
Reason (R): The deep ocean equilibrates over centuries and drift would otherwise contaminate the result.
Answer: B
Both are true and the reason gives the necessity, and residual drift is usually removed by subtracting a parallel control run. Without that subtraction a slow trend in the model itself could be mistaken for a response to the forcing applied.
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