The correct option is C Homoleptic
Unidentate and chelate are words associated with ligands, whereas coordination complexes can be either homoleptic or heteroleptic depending upon whether only one kind or different kinds of ligands linked to the metal atom/ion respectively.
If a metal is bound to only one kind of donor group in coordination sphere, then it is called homoleptic complex.
Metals bounded to more than one kind of donor group is called heteroleptic complex.