De or het afzetbevordering?

The correct Dutch article is:

de afzetbevordering

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

How to use afzetbevordering

the afzetbevorderingde afzetbevordering
this afzetbevorderingdeze afzetbevordering
that afzetbevorderingdie afzetbevordering
our afzetbevorderingonze afzetbevordering
your afzetbevorderingjouw afzetbevordering
every afzetbevorderingelke afzetbevordering
which afzetbevordering?welke afzetbevordering?
a big afzetbevordering / the big afzetbevorderingeen grote afzetbevordering, de grote afzetbevordering