Answer:
The correct option is D) pH
Explanation:
A scientific experiment comprises of an independent variable and a dependent variable.
In a scientific experiment, an independent variable is a factor which is being changed so that its effect on another factor, which is the dependent variable, can be studied.
In the following research project, as the effects of pH changes are seen on the activity of alcohol dehydrogenase enzyme, hence pH is the independent variable. The activity of the enzyme is the dependent variable.
