Homoleptic complex from the following complexes is:

A homoleptic complex is one in which the central metal atom/ion is bound to only one type of donor group (ligand).Potassium trioxalatoaluminate (III): ${\text{K}}_3[\text{Al}({\text{C}}_2{\text{O}}_4{)}_3]$. Only one type of ligand (oxalate). Homoleptic.Others contain multiple types of ligands (e.g., ammine AND chloride, or ammine AND aqua), making them heteroleptic.