In the 1800s, many people living in the cities in the United States died of infectious diseases such as cholera, which is caused by a bacterium that pollutes water. Cholera is no longer a major problem in the United States. What is the most likely reason for the elimination of cholera as a major disease? A. Advances in medicine have led to cures for cholera. B. People have learned the importance of washing their hands. C. Sewage treatment plants have eliminated such pathogens from drinking water. D. Regulations have prevented factories from dumping pollution into lakes and rivers.

Cholera is caused by a bacterium called as Vibrio cholarae. The main reason of this disease is contaminated water, which can be treated by Sewage treatment plants.

What is Sewage treatment plant?

It can also be called as wastewater treatment plants and is operated by circulating air to encourage growth of bacteria to break down sewage.

As once water is treated it reaches natural bodies of water such as rivers, lakes, estuaries, and oceans.

As pure water is not available in nature so the distinction between clean water and polluted water depends on concentration of impurities found in the water.

As cholera is caused by contaminated water so it is being eliminated by sewage treatment plants.

Thus, option C is correct.

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