De or het bestiering?

The correct Dutch article is:

de bestiering

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

How to use bestiering

the bestieringde bestiering
this bestieringdeze bestiering
that bestieringdie bestiering
our bestieringonze bestiering
your bestieringjouw bestiering
every bestieringelke bestiering
which bestiering?welke bestiering?
a big bestiering / the big bestieringeen grote bestiering, de grote bestiering