What is the leading cause of water contamination in countries without water treatment plants?
improperly managed sewage
drought
invasion by parasites
lack of public health agencies

The correct answer is "improperly managed sewage."

Explanation:

In countries that do not have water treatment plants, they experience high volumes of water contamination. In countries that do not have treatment plants, they send their waste straight into the sea, rivers, and lakes in the area. The wastewater is sent downstream and contaminates the water. The sewage gets into the plants, drinking water, and causes numerous health issues.

Some of the large cities that have improperly managed sewage are Accra, Ghana, Belo Horizonte, Brazil, and Cali, Colombia.

the answer is a