问题详情

The author of the passage is primarily concerned with
A．promoting the use of bicycles in urban areas
B．documenting the rise of car ownership in modern China
C．illustrating the importance of bike lanes in promoting bicycle usage
D．describing the various sources of air pollution in modern China
E．describing the importance of bicycles for transportation in urban China请帮忙给出正确答案和分析，谢谢！