The ions $O^{2-} , F^-, Na^+, Mg^{2+}$ and $Al^{3+}$ are isoelecronic. Their ionic radii show :

Question

( A ) A significant increase from $O^{2-}$ to $Al^{3+}$
( B ) An decrease from $O^{2–}$ to $F^–$ and then increase from $Na^+$ to $Al^{3+}$
( C ) A significant decrease from $O^{2-}$ to $Al^{3+}$
( D ) An increase from $O^{2–}$ to $F^–$ and then decrease from $Na^+$ to $Al^{3+}$