The answer to blank space is "<span>accumulation".
Psychology is the exploration of behavior and psyche, grasping all parts of cognizant and oblivious experience and also thought. It is a scholastic discipline and a sociology which tries to comprehend people and groups by setting up general standards and investigating particular cases.
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Answer: The purpose of the index is to give the reader an informative, balanced portrait of what is in the book and a concise, useful guide to all pertinent facts in the book. These facts, in the form of an alphabetically ordered list of main entries and subentries, will include both proper names and subjects.
More information is needed to answer. Also, what is the options for the statements?