Q16

Scientists conducted an experiment to investigate the effectiveness of treating water from storage dams with UV radiation.
The experiment was conducted more than three times. The results are shown in the table.
What conclusion may be drawn from the data obtained?
A. The control plates are contaminated.
B. High doses of UV eliminate all pathogens.
C. Exposure to UV inhibits reproduction of bacteria.
D. The presence of bacteria reduces the amount of UV.