Researchers disagree on how stress and job satisfaction affect longevity. There isn’t enough data available to support a linkbetween stress and longevity, says Edward L. Schneider, M.D., dean of the Andrus Gerontology Center at the University of SouthernCalifornia. Animal research, however, provides exciting insights. In studies with laboratory rats, certain types of stress damage theimmune system and destroy brain cells, especially those involved in memory. Other kinds of stress enhance immune function by 20 to30 percent, supporting a theory first advanced by Hans Selye, M.D., Ph.D., a pioneer in stress research. He proposed that an exciting,active and meaningful life contributes to good health.
     The relationship between job satisfaction and longevity also remains in question. According to some researchers, a satisfying jobadds years to a man’s life, while volunteer work increases a woman’s longevity. These findings may change as more women participatein the workforce. One study found that female clerical workers suffered twice as many heart attacks as homemakers. Factors associatedwith the coronary problems were suppressed hostility, having a nonsupportive boss, and decreased job mobility.
35. What is the main purpose of this passage?
(A) To tell people how to live longer.
(B) To urge working women to quit their jobs.
(C) To persuade people to live an exciting, active, and meaningful life.
(D) To tell people the factors that might affect long life.