What Does It Mean to Say That an Experiment Has

What does it mean to say that an experiment has two independent variables?

A) The researcher has created a study with two different conditions.
B) The researcher has come up with two different measures to take in order to test the hypothesis.
C) The researcher is manipulating two different variables in the course of the study.
D) The effects of one variable in the study have nothing to do with the effects of the other variable.

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