An investigator who conducts an experiment to determine how changes in pH affect the function of enzymes on digestion is most likely to be a physiologist. The correct option is C.
A physiologist examines human organization and how its organs and systems interact at the cellular and molecular levels under normal and anomalous conditions.
A physiologist may excel in the physiology of a specific body area, function, or system, as well as in the physiology of plants or animals.
A physiologist is likely to conduct a study to see how changes in pH influence the impact of enzymes on digestion.
Thus, the correct option is C.
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