Answer:
The answer is A: Infectious Diseases.
Step-by-step explanation:
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The most serious effect of water pollution for humans should be option A. Infectious Diseases.
Infectious diseases is the disease that should be caused by the microorganism i.e. pathogenic. It involved the fungi, viruses, bacteria,etc. It should be spreaded from the environment even from person to person that leads to the illness.
So for the serious impact with respect to the water pollution it should be option A.
Learn more about disease here: https://brainly.com/question/24715222
