Answer:
The windbreaks are planting methods that protect topsoil from wind erosion.
Step-by-step explanation:
A is correct because the windbreaks are basically planted rows of trees or shrubs with the main purpose to minimize the effect of the wind and protect the topsoil from erosion.
B is not correct because the windbreaks can not function as barriers in total, but are plantations for minimizing the wind effect.
C is not correct because the windbreaks are not devices of any sort.
D is not correct because while they can partially prevent the influence of the wind, they can not really do much when it comes to the effect of the rainwater.