Discussion
Controlled Group is a term used in :
Answer: C
The control group is a term used in experimental research.
In an experiment the subjects are divided into an experimental group, which receives the treatment, and a control group, which does not. Comparing the two shows the effect of the treatment, because other conditions are kept the same for both.
Survey and descriptive research describe existing conditions without manipulating any variable, and historical research studies past events from records. None of them assigns a treatment, so none needs a control group.
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