Final answer:
The independent variable in an experiment is the manipulated variable, while the dependent variable is the variable being measured.
Step-by-step explanation:
The correct answer is c) Manipulated variable. The independent variable in an experiment is the variable that is directly manipulated or controlled by the person conducting the experiment. It is the variable that is intentionally changed in order to observe its effect on the dependent variable. The dependent variable, on the other hand, is the variable that is being measured or observed to see how it is affected by the independent variable.