How Do Freezing, Thawing, Wetting, and Drying Contribute to Soil

How do freezing, thawing, wetting, and drying contribute to soil creep?

A) The soil expands and contracts, lifting particles and dropping them a slight distance downslope.
B) The soil becomes much weaker when dry and frozen.
C) Eventually, these cause the soil and regolith to suddenly slide down the slope.
D) Gravity exerts a much stronger force when the soil is wet and thawed.

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