De or het marktregulering?

The correct Dutch article is:

de marktregulering

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

How to use marktregulering

the marktreguleringde marktregulering
this marktreguleringdeze marktregulering
that marktreguleringdie marktregulering
our marktreguleringonze marktregulering
your marktreguleringjouw marktregulering
every marktreguleringelke marktregulering
which marktregulering?welke marktregulering?
a big marktregulering / the big marktreguleringeen grote marktregulering, de grote marktregulering