Discussion
Assertion (A): Gypsum must be added within a fairly narrow range of proportion.
Reason (R): Too little permits flash setting while too much causes later expansion.
Answer: C
Both are true and the reason gives both limits: the specification brackets the sulphate content from each side, which is why it is stated as a maximum in the standards and controlled closely in manufacture. Both faults are serious, so the range is narrow in practice.
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