How Do Freezing,thawing,wetting,and Drying Contribute to Soil Creep

Multiple Choice

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

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