Discussion
Assertion (A): A mean heat capacity may be used in place of an integral.
Reason (R): The mean value is defined so that multiplying it by the temperature change reproduces the integral exactly.
Answer: D
Both are true and the reason gives the definition: the mean is not a simple average of the end values but the value that gives the correct area, and it is tabulated against a reference temperature. Reading the interval off the table matters as much as the value.
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