What Will the Long Term Effect of Mass Wasting Be

What will the long term effect of mass wasting be on oversteepened slopes?

A) It will cause the steep slopes to retreat uniformly, widening the valley but keeping the steep slopes at the margins.
B) It will eventually restore an equilibrium profile by reducing the slope angle.
C) It will fill in the lowland up to the level of the surrounding highland region.
D) It will perpetuate catastrophic mass failures until the entire highland region is removed