Which of These Is NOT a Reason That Psychosomatic Medicine

Which of these is NOT a reason that psychosomatic medicine fell out of favor?

A) As Freudian concepts, such as the unconscious, fell out of favor, so too did psychosomatic medicine.
B) Franz Alexander's nuclear conflict model relied too heavily on individual psychological problems.
C) Psychosomatic medicine was based on reductionism, the outmoded idea that a single flaw was sufficient to trigger disease.
D) Psychosomatic medicine, being heavily influenced by the behaviorist movement, became unpopular during the late 1960s.