Which of the following lanthanoid ion is paramagnetic  

$\begin{array}{l}\mathrm{Ce}\to \left[\mathrm{Xe}\right]4{\mathrm{f}}^{1}5{\mathrm{d}}^{1}6{\mathrm{s}}^2;\hspace{0.25em}\hspace{0.25em}\hspace{0.25em}\hspace{0.25em}{\mathrm{Ce}}^{4+}\to \left[\mathrm{Xe}\right]\\ \mathrm{Yb}\to \left[\mathrm{Xe}\right]4{\mathrm{f}}^{14}6{\mathrm{s}}^2;\hspace{0.25em}\hspace{0.25em}\hspace{0.25em}\hspace{0.25em}{\mathrm{Yb}}^{2+}\to \left[\mathrm{Xe}\right]4{\mathrm{f}}^{14}\\ \mathrm{Lu}\to \left[\mathrm{Xe}\right]4{\mathrm{f}}^{14}5{\mathrm{d}}^{1}6{\mathrm{s}}^2;\hspace{0.25em}\hspace{0.25em}\hspace{0.25em}\hspace{0.25em}{\mathrm{Lu}}^{3+}\to \left[\mathrm{Xe}\right]4{\mathrm{f}}^{14}\\ \mathrm{Eu}\to \left[\mathrm{Xe}\right]4{\mathrm{f}}^{7}6{\mathrm{s}}^2;\hspace{0.25em}\hspace{0.25em}\hspace{0.25em}\hspace{0.25em}{\mathrm{Eu}}^{2+}\to \left[\mathrm{Xe}\right]4{\mathrm{f}}^7\end{array}$