De or het productassortiment?

The correct Dutch article is:

het productassortiment

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

How to use productassortiment

the productassortimenthet productassortiment
this productassortimentdit productassortiment
that productassortimentdat productassortiment
our productassortimentons productassortiment
your productassortimentjouw productassortiment
every productassortimentelk productassortiment
which productassortiment?welk productassortiment?
a big productassortiment / the big productassortimenteen groot productassortiment, het grote productassortiment