Which of the following complexes will exhibit maximum attraction to an applied magnetic field?

Question

$\left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$

$\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$

$\left[\mathrm{Co}(\mathrm{en})_{3}\right]^{3+}$

$\left[\mathrm{Zn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$

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