单选题 Why should the rooftop garden be build on the top of City Hall other than on any other buildings?

A、 Because the City Hall is large.
B、 Because the mayor had urged the environmental department to do so.
C、 Because it can make people understand their impact on environment better through a public building.
D、 Because the experts just want to make the City Hall a convenient laboratory.

【正确答案】 C

【答案解析】[解析] 从文章倒数第四段“．．．and get people involved and understanding their impact on the environment and．．．”中可以找到明确的答案。