Which of the following statements is NOT true?

Which of the following statements is NOTtrue?

               a.  Once a person has a medical condition, negative emotions can affect the course of the illness and recovery.

           b.  Loneliness and worry can suppress the immune system and permit existing viruses, such as herpes, to erupt.

           c.  The type a personality's high reactiveness to stress is the key risk factor in heart disease.

           d.  Feeling anxious, depressed, and helpless can delay the healing of wounds after surgery, whereas feeling hopeful can speed surgery.