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【单选题】
如图是可逆反应X 2 +3Y 2 ?2Z 2 在反应过程中的反应速率（V）与时间（t）的关系曲线，下列叙述正确的是（ ）A.
t 1 时，只有正方向反应
B.
t 2 时，X 2 、Y 2 、Z 2 的物质的量相等
C.
t 2 -t 3 ，反应不再发生
D.
t 2 -t 3 ，各物质的浓度不再发生变化
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