Which series is arranged in order of increasing radius?

A.     ${\text{F}} < {\text{C}}{{\text{l}}^ - } < {\text{Cl}}$

B.     ${\text{Rb}} < {\text{K}} < {\text{Na}}$

C.     ${\text{A}}{{\text{l}}^{3 + }} < {\text{M}}{{\text{g}}^{2 + }} < {\text{N}}{{\text{a}}^ + }$

D.     ${{\text{I}}^ - } < {\text{B}}{{\text{r}}^ - } < {\text{C}}{{\text{l}}^ - }$

C