Behaviorists believe in while humanistic psychologists believe in free will.
Human Growth and Development
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Behaviorism emphasizes the importance of observable actions and scientific studies and suggests that behavior is shaped by the environment.

absolute strength refers to the maximum force exerted by a body irrespective of body size. relative strength on the other hand is the force exerted by a body in relation to muscle size or body weight.

so the answer is: c. absolute strength measures strength regardless of your body size, while relative strength measures strength adjusted for your weight.