De or het gasophoping?

The correct Dutch article is:

de gasophoping

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

How to use gasophoping

the gasophopingde gasophoping
this gasophopingdeze gasophoping
that gasophopingdie gasophoping
our gasophopingonze gasophoping
your gasophopingjouw gasophoping
every gasophopingelke gasophoping
which gasophoping?welke gasophoping?
a big gasophoping / the big gasophopingeen grote gasophoping, de grote gasophoping