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What is the primary focus of psychology?

  1. Physical health

  2. Muscle development

  3. Mental processes and behavior

  4. Nutritional science

The correct answer is: Mental processes and behavior

Psychology is the scientific study of the mind and behavior. It is primarily focused on understanding mental processes and behavior such as thoughts, emotions, and actions. This differs from physical health and muscle development, which are more related to the physical body. Similarly, nutritional science focuses on the impact of food and nutrients on the body, not on the mind and behavior. Therefore, C is the most accurate and comprehensive answer.