一定量的铁与一定量的浓HNO3反应，得到硝酸铁溶液和NO2、N2O4、NO的

一定量的铁与一定量的浓HNO₃反应，得到硝酸铁溶液和NO₂、N₂O₄、NO的混合气体，这些气体与3.36 L O₂（标准状况）混合后通入水中，所有气体完全被水吸收生成硝酸。若向所得硝酸铁溶液中加入2 mol·L^-1 的NaOH溶液至Fe³⁺恰好沉淀，则消耗NaOH溶液的体积是 ( )

A．300 mL B．150mL C．120 mL D．90mL

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