Our project must proceed at a reasonably quick tempo. Surely one month is ample time, ( )

A．isn't it

B．is it

C．it isn't

D．it is

联系对比给定资料5、6中提到的“曹德旺式”慈善和“陈光标式”慈善，你赞同哪一种形式并分析指出你赞同的原因。
[要求] 分析合理，表意清楚，逻辑严谨，字数在400字以内。