The correct answer is: A) Droughts.
Rainwater harvesting is the collection and storage of rainwater for reuse. It can be used for a variety of purposes, including drinking water, irrigation, and washing. Rainwater harvesting can help to mitigate the impact of droughts by providing a source of water during dry periods.
Flood is an overflowing of water that submerges land that is usually dry. Floods can be caused by heavy rains, melting snow, or dam failures. They can cause extensive damage to property and infrastructure, and can also lead to loss of life. Rainwater harvesting cannot help to mitigate the impact of floods.
Landslide is a mass movement of soil and rock down a slope. Landslides can be caused by a variety of factors, including heavy rains, earthquakes, and human activities. They can cause extensive damage to property and infrastructure, and can also lead to loss of life. Rainwater harvesting cannot help to mitigate the impact of landslides.
Cyclone is a large rotating storm that forms over warm waters in tropical or subtropical regions. Cyclones are known by different names in different parts of the world, such as hurricanes, typhoons, and tropical cyclones. They can cause extensive damage to property and infrastructure, and can also lead to loss of life. Rainwater harvesting cannot help to mitigate the impact of cyclones.