A Hill Consisting of Loose,dry Sand That Slopes at the Angle

A hill consisting of loose,dry sand that slopes at the angle of repose and has no vegetation

A) is stable unless oversteepened by excavation.
B) may flow if it becomes saturated with water.
C) will be more stable if vegetation takes root on the hill.
D) is stable unless oversteepened by excavation,may flow if it becomes saturated with water,and will be more stable if vegetation takes root on the hill.