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.
![What is the main purpose of the fence seen on this beach ? a) to keep sand in place b) to keep peop](/tpl/images/04/04/zBj4bipVo3fhu8rS.jpg)