__________ are used today for treating insomnia, epilepsy and other disorders

Which of the following statements is true of a hypothesis?

a. It is a sentence negating the assumption that is considered correct by a researcher. b. It is a theory that has not yet been accepted by most scientists. c. It is a statement about a relationship between variables that may be empirically tested. d. It is a precise definition of a term used in a theory.

While Freud might explain an individual's depression by focusing on the person's unconscious thoughts, a physiological psychologist might focus instead on a chemical imbalance in the brain. This difference in explanations BEST illustrates the text's unifying theme that

a. psychology evolves in a sociohistorical context. b. heredity and environment jointly influence behavior. c. psychology is theoretically diverse. d. psychology is empirical.