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【单选题】
2007年诺贝尔物理奖授予了法国科学家阿尔贝·费尔和德国科学家彼得·格林贝格尔，以表彰他们发现巨磁电阻效应。该成果推动了磁信息材料的发展，MgFe 2 O 4 是一种磁信息材料，广泛应用于电子计算机。则 MgFe 2 O 4 中Fe的化合价为 [ ]A.
＋1
B.
＋2
C.
＋3
D.
＋4
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