The author seems to believe that even in the absence of credit cards, some people would undoubtedly ______.

A．Traffic laws and regulations.
B．Driving theory and practice.
C．Switching lanes and turning corners.
D．Ways to avoid traffic accidents.

A．To talk with someone or with oneself.
B．To have a long and good relaxation.
C．To do more aerobic exercises.
D．To take more anti-anxiety drugs.