Which has maximum paramagnetic nature ?

Which has maximum paramagnetic nature ?
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Which has maximum paramagnetic nature ? A. `[Cu(H_(2)O)_(4)]^(2+)` B. `[Cu(NH_(3))_(4)]^(2+)` C. `[Mn(H_(2)O)_(6)]^(2+)` D. `[Fe(CN)_(6)]^(4-)`
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