化合物Bilirubin在一定波长的光照射下发生分解反应，反应物浓度随反应时间变化如图所示，计算反应4～8 min间的平均反应速率和推测反应16 min时反应物的浓度，结果应是( )
| A．2.5 μmol·L－1·min－1和2.0 μmol·L－1 |
| B．2.5 μmol·L－1·min－1和2.5 μmol·L－1 |
| C．3.0 μmol·L－1·min－1和3.0 μmol·L－1 |
| D．5.0 μmol·L－1·min－1和3.0 μmol·L－1 |
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