This form of water pollution causes bacteria to multiply in the water rapidly causing people who come in contact with this water to become ill, many times with diarrhea.

The correct answer is - water contamination.

Explanation:

Water contamination is a form of water pollution in which water is contaminated or polluted with several microorganisms and pathogens by industrial waste, sewage, animal waste.

It is contaminated when rainwater runoffs from agricultural farms, industrial and sewage dump that brings toxins, wastes, and fertilizers to the water body that help bacteria to multiply and infect the people who come in touch with it.

✿   this landform has a high elevation and a high relief

✿   this landform is a mountain

the median of the data is 4.5.