____________ and __________ have proven that they are highly effective in helping people cope with chronic pain, fatigue, stress headaches, and IBS.
Explanation
Answer: B - Cognitive and behavioral therapy have proven that they are highly effective in helping people cope with chronic pain, fatigue, stress headaches, and IBS.
Key Takeaway: Cognitive and behavioral therapy are effective in helping people who have physical complaints that have a strong psychological component. Stress headaches, for example, are often caused by muscle tension that is secondary to prolonged stress. Behavioral therapy can teach the sufferer to practice relaxation techniques that reduce stress. This reduction in stress will lead to a reduction in stress headaches.