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During Inca terrace construction on steep Andean slopes, which landslide trigger becomes prominent if backfill compaction lags rainfall?

A)Reduced soil-water infiltration
B)Increased hydrostatic pressure
C)Mitigated freeze-thaw action
D)Decreased soil cohesion

💡 Explanation

Increased hydrostatic pressure becomes prominent because inadequate compaction allows water accumulation, which increases pore pressure, therefore promoting slope instability and landslides rather than increased cohesion offered under fully compacted dry conditions.

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