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【单选题】
下图表示反应X(g) 4Y(g) +Z(g)；在某温度时X的浓度随时间变化的曲线。下列有关该反应的描述正确的是（  ）
A.
第6min后，反应就停止了
B.
X的平衡转化率为85%
C.
反应只进行了6min
D.
在1min内X的平均反应速率为0.7 mol·L － 1 ·min － 1
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