Which of the following is pentadentate ligand?

Ethylenediamine triacetate ion is pentadentate ligand.

Ethylenediaminetriacetic acid is one example of a pentadentate ligand, which binds with five atoms. Hexadentate ligands bind with six atoms; EDTA is one illustration of this (although it can bind in a tetradentate manner). Denticity more than 6 ligands are commonly documented.

Hence, option D is correct.