The partial differential of normal stress in y-direction in terms of effective stress is given by __________

• A. \(\frac{∂σ_y{‘}}{∂y}\)
• B. \(\frac{∂σ_y{‘}}{∂y}-γ_w \frac{∂h}{∂y}\)
• C. \(\frac{∂σ_y{‘}}{∂y}+γ_w \frac{∂h}{∂y}\)
• D. \(\frac{∂σ_y{‘}}{∂y}*γ_w \frac{∂h}{∂y}\)