某含铁盐溶液能够在高浓度的碱性环境下长期稳定存在，且具有较强

某含铁盐溶液能够在高浓度的碱性环境下长期稳定存在，且具有较强的灭菌消毒功能，该盐是一种绿色、无污染的净水剂，其化学式为Na₂FeO₃。则其中铁元素的化合价是（）

A．＋2

B．＋3

C．＋4

D．＋6

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