The correct order of ionic radii of $Ce, La, Pm$ and $Yb$ in $+3$ oxidation state is:

• A
  $La^{3+} < Pm^{3+} < Ce^{3+} < Yb^{3+}$
• B
  $La^{3+} < Ce^{3+} < Pm^{3+} < Yb^{3+}$
• C
  $Yb^{3+} < Ce^{3+} < Pm^{3+} < La^{3+}$
• D
  $Yb^{3+} < Pm^{3+} < Ce^{3+} < La^{3+}$