A client tells the nurse that My sister just never picks up colds or other illnesses that go around ...

A client tells the nurse that My sister just never picks up colds or other illnesses that go around
  each year. The only difference between the two of us is that she is highly involved in her church,
  while I'm not very spiritual..
 
  The reply that shows the best understanding of psychoimmunology is
  a. It is probably just a coincidence..
  b. No correlation between spirituality and wellness exists..
  c. Studies have shown that spiritual practices can enhance immune system
  function..
  d. The mind and body are closely interrelated, so what you say may be true..