单项选择题

As the pace of life continues to increase, we are fast losing the alt of relaxation. Once you are in the habit of rushing through life, being on the go from morning till night, it is hard to slow down. But relaxation is essential for a healthy mind and body.
Stress is a natural part of everyday life. In fact, it is not the bad thing as it supposed to be. A certain amount of stress is vital (重要的) to provide motivation and give purpose to life. It is only when the stress gets out of control that it can lead to poor performance and iii health.
The amount of stress a person can withstand (忍受) depends very much on the individual. Some people are not afraid of stress. Such characters are best for management. Others lose heart at the first signs of stress. When exposed to stress we react both chemically and physically. It is when such a reaction lasts long, through continued exposure to stress, that health becomes endangered. Since we can’t remove stress from our lives, we need to find ways to deal with it.

According to the writer, the most important character for a good manager is his（）

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