The correct order of the decreasing ionic radii among the following isoelectronic species is :

Question

( A ) $Ca^{2+} > K^+ > S^{2–} > Cl^–$
( B ) $K^+ > Ca^{2+} > Cl^– > S^{2–}$
( C ) $Cl^– > S^{2–} > Ca^{2+} > K^+$
( D ) $S^{2–} > Cl^– > K^+ > Ca^{2+}$