De or het marktafscherming?

The correct Dutch article is:

de marktafscherming

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

How to use marktafscherming

the marktafschermingde marktafscherming
this marktafschermingdeze marktafscherming
that marktafschermingdie marktafscherming
our marktafschermingonze marktafscherming
your marktafschermingjouw marktafscherming
every marktafschermingelke marktafscherming
which marktafscherming?welke marktafscherming?
a big marktafscherming / the big marktafschermingeen grote marktafscherming, de grote marktafscherming