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Which constraint limited maximum terrace height in Inca agricultural systems using stone retaining walls?

A)Reduced soil nutrient diffusion rates
B)Increased hydrostatic pressure on walls
C)Decreased sunlight exposure on lower levels
D)Accelerated topsoil erosion from rainfall

💡 Explanation

When terrace height increased, hydrostatic pressure on the retaining walls rose because the water-saturated soil exerted greater lateral force, potentially causing wall collapse. Therefore, increased hydrostatic pressure limited height, rather than nutrient diffusion, sunlight, or erosion, which pose secondary concerns for terrace design.

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