Answer: Fences.
Step-by-step explanation:
Sometimes dunes become damaged because of vehicle and foot traffic, and sometimes they are damaged because of very strong storms. Damaged dunes can become unstable, but thankfully there are steps we can take to restore them. Planting dune vegetation such as sea oats can help build, anchor, and stabilize sand dunes ("Building Back"). The plants help to trap wind-blown sand, making the dune stronger. Ideally, the dune should be 80 percent covered in vegetation. In addition, installing sand fences can help protect dunes by restricting access and preventing foot and vehicle traffic.
Hope this helped!