Which of the following is NOT one of the main branches of psychology?

Historical psychology is not recognized as one of the main branches of psychology. The primary branches of psychology focus on active areas of research and practical application within the field.

Clinical psychology deals with diagnosing and treating mental health issues, while cognitive psychology studies mental processes such as perception, memory, and problem-solving. Biological psychology, also known as biopsychology, explores the relationship between biological processes and behavior, taking into account genetics, brain function, and physiology.

In contrast, historical psychology might refer to the study of the history and development of psychological theories and practices, but it does not constitute an established branch of psychology that actively engages in research or clinical practice in the same way as the other three branches.