Which one of the following sets of ions represents the collection of isoelectronic species ?

Question

( A ) $K^+, Ca^{2+}, Sc^{3+}, Cl^-$
( B ) $Na^+, Ca^{2+}, Sc^{3+}, F^-$
( C ) $K, Ca^{2+}, Sc^{3+}, Cl^-$
( D ) $Na^+, Mg^{2+}, Al^{3+}, Cl^-$