(C) Nitric acid $(HNO_3)$ is a strong oxidizing agent. It usually oxidizes the $H_2$ gas produced to water and itself gets reduced to nitrogen oxides.

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(C) Nitric acid $(HNO_3)$ is a strong oxidizing agent. It usually oxidizes the $H_2$ gas produced to water and itself gets reduced to nitrogen oxides.However,magnesium $(Mg)$ and manganese $(Mn)$ react with very dilute nitric acid to evolve hydrogen gas.$Mg + 2HNO_3 \text{ (very dilute)} \rightarrow Mg(NO_3)_2 + H_2 \uparrow$