The research method in which a researcher conducts an in-depth investigation of an individual subject is the

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The case study method involves an in-depth investigation of an individual subject, which makes it the best choice out of the given options. Correlational method involves studying the relationship between variables, survey method involves collecting data from a group of individuals, and naturalistic observation method involves observing subjects in their natural environment.

The Research Method in Which a Researcher Conducts an In-Depth