The deflection of flow lines at interface of dissimilar soils is given by ______

• A. \(\frac{k_1}{k_2} =cosθ\)
• B. \(\frac{k_1}{k_2} =sinθ \)
• C. \(\frac{k_1}{k_2} =\frac{tanθ_1}{tanθ_2} \)
• D. \(\frac{k_1}{k_2} =cotθ\)