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【单选题】
下列说法中，可以充分说明反应P(g) + Q(g) = R(g) + S(g)在恒温下已经达到平衡的是：A.
反应容器内的压强不随时间变化
B.
反应容器内P、Q、R、S四者共存
C.
体系中P和S的生成速率相等
D.
在加入一些物质的量的Q，其他物质的物质的量不发生变化
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