De or het carpoolbevordering?

The correct Dutch article is:

de carpoolbevordering

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

How to use carpoolbevordering

the carpoolbevorderingde carpoolbevordering
this carpoolbevorderingdeze carpoolbevordering
that carpoolbevorderingdie carpoolbevordering
our carpoolbevorderingonze carpoolbevordering
your carpoolbevorderingjouw carpoolbevordering
every carpoolbevorderingelke carpoolbevordering
which carpoolbevordering?welke carpoolbevordering?
a big carpoolbevordering / the big carpoolbevorderingeen grote carpoolbevordering, de grote carpoolbevordering