Discussion
Assertion (A): Most of the risk of drying cracks occurs early rather than late in the drying cycle.
Reason (R): Shrinkage takes place during the constant rate period while water is still leaving the surface film.
Answer: C
Both are true and the reason gives the reason for the emphasis: differential shrinkage between a dry surface and a wet interior generates the stresses, and once shrinkage is complete the remaining drying is comparatively safe.
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