De or het detailhandelsonderneming?

The correct Dutch article is:

de detailhandelsonderneming

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

How to use detailhandelsonderneming

the detailhandelsondernemingde detailhandelsonderneming
this detailhandelsondernemingdeze detailhandelsonderneming
that detailhandelsondernemingdie detailhandelsonderneming
our detailhandelsondernemingonze detailhandelsonderneming
your detailhandelsondernemingjouw detailhandelsonderneming
every detailhandelsondernemingelke detailhandelsonderneming
which detailhandelsonderneming?welke detailhandelsonderneming?
a big detailhandelsonderneming / the big detailhandelsondernemingeen grote detailhandelsonderneming, de grote detailhandelsonderneming