Which group of words would BEST exemplify the outcome of a factor analysis?

Question

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Factor analysis aims to identify underlying variables, or factors, that explain the pattern of correlations within a set of observed variables. Choices B, C, and D mix traits that are less likely to cluster together based on common underlying factors. Choice A groups together "shy," "withdrawn," and "reserved," which are all traits likely to be influenced by a common factor related to social interaction, making it the best example of an outcome of factor analysis.

Which Group of Words Would BEST Exemplify the Outcome of a Factor