De or het concurrentiestelling?

The correct Dutch article is:

de concurrentiestelling

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

How to use concurrentiestelling

the concurrentiestellingde concurrentiestelling
this concurrentiestellingdeze concurrentiestelling
that concurrentiestellingdie concurrentiestelling
our concurrentiestellingonze concurrentiestelling
your concurrentiestellingjouw concurrentiestelling
every concurrentiestellingelke concurrentiestelling
which concurrentiestelling?welke concurrentiestelling?
a big concurrentiestelling / the big concurrentiestellingeen grote concurrentiestelling, de grote concurrentiestelling