De or het markttoetreding?

The correct Dutch article is:

de markttoetreding

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

How to use markttoetreding

the markttoetredingde markttoetreding
this markttoetredingdeze markttoetreding
that markttoetredingdie markttoetreding
our markttoetredingonze markttoetreding
your markttoetredingjouw markttoetreding
every markttoetredingelke markttoetreding
which markttoetreding?welke markttoetreding?
a big markttoetreding / the big markttoetredingeen grote markttoetreding, de grote markttoetreding