Arrange the ions $Ce^{+3}, La^{+3}, Pm^{+3},$ and $Yb^{+3}$ in the increasing order of their ionic radii.
- A$Yb^{+3} < Pm^{+3} < Ce^{+3} < La^{+3}$
- B$Ce^{+3} < Yb^{+3} < Pm^{+3} < La^{+3}$
- C$Yb^{+3} < Pm^{+3} < La^{+3} < Ce^{+3}$
- D$Pm^{+3} < La^{+3} < Ce^{+3} < Yb^{+3}$
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