What is the main topic of this passageA．Don’t hesi

单项选择题

Procrastination(犹豫不决) is a disease of the mind. A scientific study in recent years has shown that it is a close relative of sadness and attention disorder; that procrastinators tend to be the result of low self-confidence and are likely to experience anxiety. The research has shown, what is more, that the illness has become quite common. Susan Robert, a behavioral psychologist who has written a book called Living With Procrastination., says that about a quarter of the adult population of the United States and Canada is reported to have serious problems with procrastination. " when we say ’serious’ we mean people for whom procrastination causes great discomfort and suffering. We ’ve found that such people are more troubled by daily life than others, that possibility of anxieiy is much higher among them than in the rest of the population. In a society driven by achievement, it is little wonder that not being able to work at full steam will bring people sadness. Surely, in the land of opportunity, this anxiety has produced an industry of experts offering solutions. Many books and specialist solutions have appeared. In exchange for $19. 95, Dr. Jerome Murray will send out an audio-cassette called "Protect your future from the thief of procrastination. " Dr. Murray promises that if you follow his step-by-step rules you will be empowered to "turn self-defeat into self-realization". "Since the start of the 1990s, procrastination has been taken more and more seriously , " said Dr. Roberts, who has been treating patients troubled by the condition for more than 20 years. "It is now recognized as a true mental heath problem and is being seen more as a psychological problem and less as a moral issue.

What is the main topic of this passage

A．Don’t hesitate to give up smoking.
B．Don’t regard depression as not important.
C．Delay can be a sign of illness.
D．Don’t work too hard to stay healthy.