Soil erosion is a process where the top soil layer is washed away because of the effects of water or wind. An agricultural area loses its topsoil because of excess flooding. What three actions can be taken to stop the erosion and conserve the fertility of the land?

Plant vegetation so that their roots hold the soil firmly.

Build walls around the farm area.

Add natural fertilizers to the soil.

Cut down tall, strong trees that stand in the middle of the farm.

Increase the plowing of soil and grazing in the farm area.