The study 'Tearoom Trade' (1970) conducted by Laud Humphreys is an illustration of which research method?

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Research based on historical dataResearch using questionnaires and pollsResearch involving direct involvement and observationResearch using controlled experiments

Explanation

Laud Humphreys' 'Tearoom Trade' is a classic example of participant observation, where the researcher immerses themselves in the environment to gather data firsthand, rather than relying on surveys, historical records, or experimental setups.