题目内容：
阅读下列短文,回答题目.Driving cars, trucks and motorcycles is an important part of our lives. We do it every day toget to work, to school or to friends' houses.
Driving can be very convenient, but can also cause many problems. Waiting in line at a red light, a driver may get impatient and decide just to drive right through it. If another car is coming from the other direction, there might be a terrible accident. Cutting another car off can make its driver angry, so that driver cuts off someone else. Pretty soon everybody is angry, and impatient.Traffic accidents decline millions of lives every year worldwide. In Taiwan alone, over seven people are killed in accidents every day. The annual death rate from traffic accidents in Taiwan is twice that of Japan.
To allow traffic to move smoothly and safely, everybody must follow the rules. Before youdrive, learn all the traffic laws. That way of driving is safe, convenient and even fun !
The underlined word "convenient" in the passage means_______ A．handy, easy to do
B．that can be changed
C．fond of drinking and merry-making
D．carriages or other trucks
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