An ionic solid $$\mathrm{LaI_2}$$ shows electrical conduction due to presence of

A

$$\mathrm{La^{2+}}$$ and $$2\mathrm{I^-}$$

B

$$\mathrm{La^{3+}}$$, $$2\mathrm{I^-}$$ and $$e^-$$

C

$$\mathrm{La^{2+}}$$, $$\mathrm{I_2}$$ and $$2e^-$$

D

$$\mathrm{La^{3+}}$$, $$\mathrm{I_2}$$ and $$3e^-$$