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

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