The Reason Clay Minerals (And Other Phyllosilicate)often Form the Slip

The reason clay minerals (and other phyllosilicate) often form the slip plane for a landslide is that they

A) Have platy structures, allowing them to stack up and then slip past each other, like a deck of cards and also have high porosity.
B) Have rigid structures that can trap oil and the oil acts as a lubricant for the landslide.
C) Are made of material that dissolves easily in water, initiating a landslide in the process.
D) Change their internal structure under stress, allowing them to get "mushy" and thus be slippery.