Which of the following is not free to first-class passengers with this airline

A．how some bosses act displeasingly
B．how optimists explain some bad events
C．how pessimists think about the unhappy things around them
D．how the writer suggests people should do when facing something unpleasant

A．My father was an optimist.
B．My father didn' t like to take any preventive measures.
C．My father often visited doctors.
D．My father was wise enough to mind his own health.