Donor atoms in ethylenediamine are
 

Given:

Donor atoms in ethylenediamine are

Explanation:

The number of times a ligand attaches to metal via non-contiguous donor sites is referred to as denticity. Many ligands may bind metal ions at several places, mainly because they have lone pairs on more than one atom. Chelating ligands are those that bind via more than one atom. A bidentate ligand binds through two sites, while a tridentate ligand binds through three sites.

A donor is a dopant atom in semiconductor physics that, when introduced to a semiconductor, can create an n-type zone.

Hence, the correct option is (A)  N and N