Question

Which of the following is most likely way for bacteria and viruses to enter a water supply? A).increased photosynthesis releases bacteria and viruses B).poor sanitation habits cause water to mix with sewage C).water from a burst sweeps particulate matter into a nearby river D).chemical fertilizers dumped into the water attract bacteria and viruses

Answer 1

Id say its B, it makes more sence as most bacterial contamination is brought on by poor sanitation or hygiene.  

Answer 2

B. Poor sanitation habits cause water to mix with sewage.