Answer:
A. Reservoir or Source.
Explanation:
Reservoirs are artificial lakes used to store water. The vast majority of reservoirs are created by damming rivers. A reservoir can also be made by damming the exit of a natural lake to regulate the water level. The dam regulates the outflow of water from the reservoir. Before the causative agent of malaria or guinea worm sickness can be transmitted to people, it must mature in an intermediate host.
Service reservoirs are completely artificial structures that do not rely on damming a river or lake. Cisterns can be dug in underground caves or elevated in a water tower. For thousands of years, humans have been constructing reservoirs. The Jawa Dam, located in modern-day Jordan, is the world's oldest dam. Around 3000 BCE, it was constructed to store water for irrigation or crop watering.
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