De or het donorwerving?

The correct Dutch article is:

de donorwerving

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

How to use donorwerving

the donorwervingde donorwerving
this donorwervingdeze donorwerving
that donorwervingdie donorwerving
our donorwervingonze donorwerving
your donorwervingjouw donorwerving
every donorwervingelke donorwerving
which donorwerving?welke donorwerving?
a big donorwerving / the big donorwervingeen grote donorwerving, de grote donorwerving