The correct answer is: A. Water Conservation.
Rainwater harvesting is the collection of rainwater into man-made storage structures for various uses, such as watering crops, replenishing groundwater, or domestic use. It is a major method implemented for water conservation.
Soil conservation is the prevention of soil loss from erosion or reduced fertility caused by overgrazing and other poor land management practices. Forest conservation is the practice of preserving forests, which are important for a variety of reasons, including their role in the water cycle, their ability to store carbon, and their provision of habitat for wildlife. Ecological conservation is the practice of protecting the natural environment, including its plants and animals, its ecosystems, and its geological features.
Rainwater harvesting is a sustainable way to collect water, and it can be used in a variety of settings, including urban areas, rural areas, and agricultural areas. It can help to reduce the demand for water from other sources, such as groundwater and surface water, and it can also help to improve water quality. Rainwater harvesting is a cost-effective way to conserve water, and it can be implemented by individuals, businesses, and communities.