What is slope stability factor of safety and how is it used in retaining structures?

• A. The ratio of driving forces to resisting forces; used to maximize deformation.
• B. The ratio of resisting forces to driving forces; used to assess stability of slopes/embankments and to set design requirements.
• C. A measure of vegetation density used in stabilizing slopes.
• D. The ratio of soil moisture to groundwater level.

Answer: (B)