Use the experimental data to determine the rate law equation for the following reaction: $M{g}_{(s)}+I_{2(g)}Mg{I}_{2(s)}$

a$)r=k[Mg][I_2{]}^2$

b$)r=k[I_2{]}^2$

c$)r=k[Mg{]}^2[I_2{]}^2$

d$)r=k[Mg][I_2]$