Which mode of research allows the researcher to directly control all relevant variables?

Name: Which mode of research allows the researcher to directly control all relevant variables?
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Question

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Experiments allow the researcher to directly manipulate and control all relevant variables, providing a high level of control over the research environment. Field research, surveys, and unobtrusive research may involve less control over variables due to their more naturalistic and observational nature.

Which Mode of Research Allows the Researcher to Directly Control