You perform an experiment to see if antibacterial toothpaste will affect the amount of dental plaque on teeth, as compared to a control group that brushes with plain toothpaste. A null hypothesis for this experiment could be:
A. Neither type of toothpaste affects dental plaque.
B. Antibacterial toothpaste reduces more dental plaque.
C. Antibacterial toothpaste is less effective at reducing plaque than plain toothpaste is.
D. Both types of toothpaste affect dental plaque to the same degree.
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