The correct option is B Deforestation
Deforestation is the process of clearing forest land for human activities. Usually, when it rains the trees in the forest do not allow all of the water to fall to the ground, this reduces the amount of water that flows into the water bodies. Preventing this water-fall helps to prevent the water bodies from flooding. Also, the trees reduce the flow of the water bodies and slow them down and therefore prevents the waterbodies from flooding the nearby areas.