De or het neusverstopping?

The correct Dutch article is:

de neusverstopping

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

How to use neusverstopping

the neusverstoppingde neusverstopping
this neusverstoppingdeze neusverstopping
that neusverstoppingdie neusverstopping
our neusverstoppingonze neusverstopping
your neusverstoppingjouw neusverstopping
every neusverstoppingelke neusverstopping
which neusverstopping?welke neusverstopping?
a big neusverstopping / the big neusverstoppingeen grote neusverstopping, de grote neusverstopping