Several Hypothesizes Have Been Proposed to Explain the Movement of Struzstroms.Which

Several hypothesizes have been proposed to explain the movement of struzstroms.Which of the following statements is not one of these hypotheses?

A) Water provides lubrication for the fluid like flow.
B) Steam liquefies and fluidizes the moving mass.
C) The falling mass traps a volume of air beneath it and then rides atop this cushion of air (like an air hockey puck) .
D) The knocking together of fragments as they travel down slope set up vibrations resulting in acoustic fluidization.
E) Earthquakes or volcanic eruptions release geological vibrations that result in geo-fluidization of the falling mass.