Discussion
The research which is conducted by controlling one or more variables is :
Answer: C
It is experimental research.
In experimental research the investigator deliberately manipulates one or more independent variables and controls other variables, often using control and experimental groups, to observe the effect on a dependent variable. Control of variables is what allows a cause-and-effect conclusion.
Pure research aims at knowledge for its own sake, whatever its method. Quantitative research measures and analyses numerical data but need not control variables; surveys are quantitative without being experimental. Evaluation research judges the effectiveness of a programme.
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