A controlled procedure that tests the effect of one variable on another is known as experiment.
What is experiment?
An experiment is a set of actions and observations, performed in the context of solving a particular problem or question, to support or falsify a hypothesis or research concerning phenomena.
An experiment generally tests how one variable is affected by another.
Thus, a controlled procedure that tests the effect of one variable on another is known as experiment.
The correct answer is option B. "experiment"
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