Which of the following had the "narrowest" view of topics acceptable to the field of psychology?

Name: Which of the following had the "narrowest" view of topics acceptable to the field of psychology?
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Titchner, a proponent of structuralism, had the narrowest view of topics acceptable to the field of psychology, focusing primarily on the analysis of the adult human mind's structure through introspection, excluding areas like animal psychology, child psychology, and abnormal psychology.

Which of the Following Had the "Narrowest" View of Topics