De or het thuisverdediging?

The correct Dutch article is:

de thuisverdediging

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

How to use thuisverdediging

the thuisverdedigingde thuisverdediging
this thuisverdedigingdeze thuisverdediging
that thuisverdedigingdie thuisverdediging
our thuisverdedigingonze thuisverdediging
your thuisverdedigingjouw thuisverdediging
every thuisverdedigingelke thuisverdediging
which thuisverdediging?welke thuisverdediging?
a big thuisverdediging / the big thuisverdedigingeen grote thuisverdediging, de grote thuisverdediging