Final answer:
Experimental research methods like controlled experiments establish causation by allowing variable manipulation and causal inferences.
Explanation:
Experimental research methods, such as controlled experiments, are the ones that show causation by allowing researchers to manipulate one variable and observe the effect on another variable, leading to causal inferences.
In contrast, methods like correlational studies, surveys, and naturalistic observations do not establish causation but rather focus on relationships between variables or observations in a natural setting without manipulation.
Therefore, an experiment is the research method that best demonstrates causation in psychology.
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