根据短文理解，选择正确答案。
Forgiving(原谅) someone who has hurt you or let you down is never an easy thing. Several new studies, however, say that it could have a lot of health benefits. When you think of forgiveness, you probably don't think of it as being a health or medical problem. Studies from Stanford University, on the other hand, show that something like anger(愤怒) can change your well-being.
When cartoon book characters like the Incredible Hulk get angry, they change colors and often gain special power. In the real world, anger is less obvious and may be more dangerous. That's why Professor Fred Luskin, founder of the Stanford Forgiveness Project and author of Forgive for Good, say holding on to anger and hatred(仇恨) can harm your physical and mental health. Two new studies seem to show the same idea. The studies find that people who are able to forgive feel less stress, less back pain, and less unhappiness. They also have fewer headaches, lower blood pressure and fewer problems on sleeping.
So it doesn't matter if your anger is caused by the traffic or other things. Learning to let it go is important. Skills such as deep breath or thought can help. Or just ask yourself if it's worth hurting yourself by staying angry with someone else.
Forgiveness doesn't mean that you simply accept what happened and say it's OK. Instead, it's a way of making peace with yourself about what happened in the past.
____