De or het sponsorcommissie?

The correct Dutch article is:

de sponsorcommissie

Rule Words ending in -tie and -sie: almost always de. See the rule

How to use sponsorcommissie

the sponsorcommissiede sponsorcommissie
this sponsorcommissiedeze sponsorcommissie
that sponsorcommissiedie sponsorcommissie
our sponsorcommissieonze sponsorcommissie
your sponsorcommissiejouw sponsorcommissie
every sponsorcommissieelke sponsorcommissie
which sponsorcommissie?welke sponsorcommissie?
a big sponsorcommissie / the big sponsorcommissieeen grote sponsorcommissie, de grote sponsorcommissie