Which of the following statements is true of the practitioners of the psychodynamic approach?

a. they believe that personality is shaped entirely by genetic factors
b. they believe that sexual and aggressive impulses buried deep within the unconscious mind influence the way people think
c. they emphasize that psychology should be about what people do and should not concern itself with things that cannot be seen, such as thoughts, feelings, and goals.
d. they use evolutionary ideas such as adaptation, reproductions, and natural selection as the basis for explaining specific human behaviors