De or het banketafdeling?

The correct Dutch article is:

de banketafdeling

Rule Words ending in -ing: almost always de. See the rule

How to use banketafdeling

the banketafdelingde banketafdeling
this banketafdelingdeze banketafdeling
that banketafdelingdie banketafdeling
our banketafdelingonze banketafdeling
your banketafdelingjouw banketafdeling
every banketafdelingelke banketafdeling
which banketafdeling?welke banketafdeling?
a big banketafdeling / the big banketafdelingeen grote banketafdeling, de grote banketafdeling