De or het vetafzetting?

The correct Dutch article is:

de vetafzetting

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

How to use vetafzetting

the vetafzettingde vetafzetting
this vetafzettingdeze vetafzetting
that vetafzettingdie vetafzetting
our vetafzettingonze vetafzetting
your vetafzettingjouw vetafzetting
every vetafzettingelke vetafzetting
which vetafzetting?welke vetafzetting?
a big vetafzetting / the big vetafzettingeen grote vetafzetting, de grote vetafzetting