Mg has favourable standard reduction electrode potential $\left(E_{{\mathrm{Mg}}^{2+}/\mathrm{Mg}}^{\circ }=-2.37\mathrm{V}\right)$ but it does not react readily. It is because of 

• A

  its resemblance to Li

• B

  formation of protective oxide layer

• C

  its oxidising nature

• D

  its reaction with acids