What Is the Chief Mass Wasting Concern Associated with Permafrost

What is the chief mass wasting concern associated with permafrost?

A) Manmade structures tip, sag, and slide when the permafrost melts because of insulation or heating associated with the structures.
B) Frozen soils fail and slide like fractured bedrock.
C) Debris flows of ice and soils occur frequently.
D) Ice in the frozen soils is low density and low strength, failing by fracture under any applied load.

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