The diamagnetic species is: (I)\[{{\left[ Cu{{\left( CN \right)}_{4}} \right]}^{3-}}\] (II) \[{{\left[ Co{{\left( N{{H}_{3}} \right)}_{6}} \right]}^{3+}}\] (III) \[{{\left[ Ni{{\left( N{{H}_{3}} \right)}_{6}} \right]}^{2+}}\] (IV) \[{{\left[ Fe{{\left( CN \right)}_{6}} \right]}^{3-}}\]

• A. I, III                 
• B. I, II
• C. III, IV               
• D. only IV