Which species have dative covalent bonding?

I.     ${\text{[Fe(}}{{\text{H}}_{\text{2}}}{\text{O}}{{\text{)}}_{\text{6}}}{\text{]C}}{{\text{l}}_{\text{3}}}$

II.     ${\text{NH}}_4^ +$

III.     ${{\text{H}}_{\text{2}}}{\text{O}}$

A.     I and II only

B.     I and III only

C.     II and III only

D.     I, II and III

A