Which effect consistently limited the agricultural productivity of Inca terraced farming at high altitudes?

💡 Explanation

When nighttime temperatures drop below freezing at high altitudes, frost heave occurs because water within the soil freezes and expands, disrupting the roots, significantly shortening the growing season, which limited agricultural productivity. Therefore shorter seasons are the primary limitation, rather than oxygen depletion, limited sunlight, or heightened erosion, which are less specifically tied to altitude/terrace geometry.

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