The word "civility" in the last sentence of the passage could best be replaced by ______.

A．can be used to replace a flat tire
B．provides a kind of temporary support to the flat tire
C．is capable of moving as quickly as a wheel
D．is as flexible and durable as an ordinary wheel

A．It can be used on almost any type of vehicles.
B．It is safe.
C．It can be fixed quickly and easily.
D．It is inexpensiv