Which Isoelectronic Series Is Correctly Arranged in Order of Increasing

Multiple Choice

Which isoelectronic series is correctly arranged in order of increasing radius?

A) K⁺ < Ca²⁺ < Ar < Cl^-
B) < Ar < K⁺ < Ca²⁺
C) Ca²⁺ < Ar < K⁺ < Cl^-
D) Ca²⁺ < K⁺ < Ar < Cl^-
E) Ca²⁺ < K⁺ < Cl^- < Ar