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【单选题】
已知反应A＋3B=2C＋D在某段时间内以A的浓度变化表示的化学反应速率为2 mol·L －1 ·s －1 ，则此段时间内用B的浓度变化表示的化学反应速率为(　　)。
A.
5 mol·L －1 ·s －1
B.
6 mol·L －1 ·s －1
C.
2 mol·L －1 ·s －1
D.
3 mol·L －1 ·s －1
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