De or het trustvorming?

The correct Dutch article is:

de trustvorming

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

How to use trustvorming

the trustvormingde trustvorming
this trustvormingdeze trustvorming
that trustvormingdie trustvorming
our trustvormingonze trustvorming
your trustvormingjouw trustvorming
every trustvormingelke trustvorming
which trustvorming?welke trustvorming?
a big trustvorming / the big trustvormingeen grote trustvorming, de grote trustvorming