De or het landarrangement?

The correct Dutch article is:

het landarrangement

Rule Words ending in -ment: usually het. See the rule

How to use landarrangement

the landarrangementhet landarrangement
this landarrangementdit landarrangement
that landarrangementdat landarrangement
our landarrangementons landarrangement
your landarrangementjouw landarrangement
every landarrangementelk landarrangement
which landarrangement?welk landarrangement?
a big landarrangement / the big landarrangementeen groot landarrangement, het grote landarrangement