Identify the correct order of the size of the following :

Question

( A ) $Ar< Ca^{2+} < K^+ < Cl^{-} < S^{2-}$
( B ) $Ca^{2+} < K^+ < Ar < Cl^{-} < S^{2-}$
( C ) $Ca^{2+} < K^+ < Ar < S^{2-} < Cl^{-}$
( D ) $Ca^{2+} < Ar < K^+ < Cl^- < S^{2-}$