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Which environmental risk accelerates structural failure in Mughal-era buildings featuring pietra dura inlay?

A)Freeze-thaw cracking of marble
B)Sulfate attack on brick mortar
C)Oxidation of iron support beams
D)Differential thermal expansion

💡 Explanation

Differential thermal expansion causes early cracking, because the varying expansion rates between inlaid stones and marble creates stress concentrations in mortar joins; therefore expansion cycling ruins the structures, rather than material transformations alone.

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