Answer:
Cause and effect
Step-by-step explanation:
You can rule out sequence since it's not really telling a story
It's not Compare and Contrast because it's not stressing the importance of water with fluoride or without fluoride in the water
It's not Problem and Solution because water without Fluoride was not an issue, simply a precaution.
Leaving C) as our answer, this shows the effects of Fluoride in our drinking water and how it affects the population.
Hope this helps!