I think the kind of choices would be primary or secondary source: and this would be a secondary source:
a primary source would be the journals where the results were published and the secondary would be the tv program that used those reports as a primary report!
so the answer is secondary source!
Many factors affect water quality
Sedimentation.
Runoff.
Erosion.
Dissolved oxygen.
pH.
Temperature.
Decayed organic materials.
Pesticides.
