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【单选题】
在恒温恒容条件下将一定量NO 2 和N 2 O 4 的混合气体通入密闭容器中，发生反应。反应中各组分浓度随时间变化关系如图。下列说法中，正确的是
A.
a、b、c、d四个点中，只有b点的化学反应处于平衡状态
B.
前10 min内用 υ (NO 2 )表示的化学反应速率为0.04 mol/(L·min)
C.
25 min时，导致平衡移动的原因是升高温度
D.
a点，用 υ (NO 2 )表示的化学反应速率等于用 υ (N 2 O 4 )表示的化学反应速率
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