The equilibrium equation in X-direction in terms of effected stress for a saturated soil body is given by __________

• A. ( frac{ _x{ }}{ x}+ frac{ _{yx}}{ y}=0 )
• B. ( frac{ _{xy}}{ x}+ frac{ _y{ }}{ y}+ frac{ _{zy}}{ z}+ _w frac{ h}{ x}=0 )
• C. ( frac{ _{xz}}{ x}+ frac{ _{yz}}{ y}+ frac{ _z{ }}{ z}+ _w frac{ h}{ x}=0 )
• D. ( frac{ _x{ }}{ x}+ frac{ _{yx}}{ y}+ frac{ _{zx}}{ z}+ _w frac{ h}{ x}=0 )