Answer the following question given this paragraph: 

Planting rows of trees around fields is another way to reduce wind erosion. The trees slow down the wind, so it doesn’t cause as much erosion. Fences like the one in Figure below serve the same purpose. The fence in the figure is preventing erosion and migration of sand dunes on a beach.


Q: Planting a row of trees around a field or erecting a fence on a sand dune helps prevent what form of erosion?

 Choices:

- fire

- water

- rain

- wind

A:
wind
