Answer :
I think the correct answer from the choices listed above is the last option. Polluted water sources would most likely affect one’s personal health since pathogens would invade the body and cause disease, such as giardia. Pathogens would go with the water we take in our body and would disturb the processes inside causing illnesses.
Answer: Pathogens would invade the body and cause disease, such as giardia.
Explanation:
The water body get polluted by the disposal of biological and non-biological wastes liberated by the human society so as to get rid of those wastes. The biological wastes includes the slurry of sewage which mainly includes the human and animal fecal matter which includes the pathogens which colonize and deteriorates the quality of water.
If the water from such water body if taken for the purpose of drinking, cooking and other crucial activities will likely to introduce the pathogens into the human body which invade the human immune system and can cause deadly diseases such as giardia.