The deepest point in the ocean is called the challenger deep and is located in the mariana trench. due to its depth, the water located in this location is very cold with the exception of

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.