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Which constraint increased during pre-industrial road aggregate production?

A)Transportation energy requirements rise greatly
B)Hydraulic head pressure becomes irregular
C)Refractory material demand accelerates slightly
D)Torsional stress limitations worsen significantly

💡 Explanation

Transportation energy increased mainly because longer-distance quarrying resulted in higher draft animal and human labor needs for road aggregate, rather than hydraulic or thermal influences on aggregate because efficient processing methods remain nascent.

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