According to Paragraph 2, what is the general attitude towards business on campuses dominated by purer disciplines

A．A visit to a prison.
B．The influence of his father.
C．A talk with some miserable slaves.
D．His experience in the war between France and Austria.

A．Brush your teeth right before you go to bed in the evening.
B．Have as few of your teeth pulled out as possible.
C．Have your teeth X-rayed at regular intervals.
D．Clean your teeth shortly after eating.