Periodic Table and Periodicity

Given below are two statements: one is labelled as Assertion $\mathbf{A}$ and the other is labelled as Reason $\mathbf{R}$ Assertion A : The energy required to form $\mathrm{Mg}^{2+}$ from $\mathrm{Mg}$ is much higher than that required to produce $\mathrm{Mg}^+$ Reason $\mathbf{R}: \mathrm{Mg}^{2+}$ is small ion and carry more charge than $\mathrm{Mg}^{+}$ In the light of the above statements, choose the correct answer from the options given below.