A 5 m wide braced excavation is made in a saturated clay,as shown in Figure P19.1, with the following properties:c = 20 kN/m², phi = 0, and gamma = 18.5 kN/m³. The struts are spaced at 5 m center to center in plan. b. Determine the section modulus of the sheet pile required,assuming oall170 MN/m?. c. Determine the maximum moment for the wales at levelsTB and C.