The size of ionic species is correctly given is the order.
A. Na⁺>Mg⁺² >Cl⁺⁷>Si⁴⁺
B. Na⁺>Mg⁺²>Si⁴⁺>Cl⁺⁷
C. Cl⁺⁷>Si⁺⁴>Mg⁺²>Na⁺
D. Cl⁺⁷>Na⁺>Mg⁺²>Si⁺⁴