13. In which choice are the species listed in order of increasing radius?
(A) Cl^– , S^2– , P^3–
(B) Na⁺ , Mg²⁺, Al³⁺
(C) Ar, K⁺ , Cl^–
(D) Cl^– , Ar, K⁺
(E) P^3– , S ^2– , Cl ^–

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