Question: The correct answer is 3 but I don't understand it at all. Please show the steps of how to get to the solution. I have
The correct answer is 3 but I don't understand it at all. Please show the steps of how to get to the solution. I have a hard time understanding this concept.

Select the appropriate defect reaction for doping MgO with Cr2O3. 1) Cr2033MgOCCrMg+VMg+3OOx 2) Cr203MgO2rMg+VMg+3OOx 3) Cr2033MgO2CrMg+VMg+3OOx
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