Which Statement Best Summarizes Psychoanalytic Thinking About Mental Energy

Which statement best summarizes psychoanalytic thinking about mental energy?

A) Freud believed that mental energy was limited, whereas modern psychologists believe that the mind's processing ability is limited.
B) Freud believed that the mind's processing ability was limited, whereas modern psychoanalysts believe that mental energy is limited.
C) Freud, like modern psychologists, believed that mental energy is limited.
D) Freud and his followers believed that mental energy could be precisely quantified through the process of psychoanalysis.