Which of the following is not mentioned by the author as one of many causes of stress in t

Which of the following is not mentioned by the author as one of many causes of stress in the passage？

A．The boredom and frustration brought by unemployment.

B．The poorness of living space and housing shortage.

C．The stress and depression produced by sleeplessness.

D．The worry about financial and economic situation.

请帮忙给出正确答案和分析，谢谢！