In which of the following reactions,$MgO$ is not formed?
- A$Mg + CO_2 \longrightarrow$
- B$Mg + \text{dil. } HNO_3 \longrightarrow$
- C$Mg + NO \xrightarrow{\Delta}$
- D$Mg + B_2O_3 \longrightarrow$
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