De or het concessieovereenkomst?

The correct Dutch article is:

de concessieovereenkomst

How to use concessieovereenkomst

the concessieovereenkomstde concessieovereenkomst
this concessieovereenkomstdeze concessieovereenkomst
that concessieovereenkomstdie concessieovereenkomst
our concessieovereenkomstonze concessieovereenkomst
your concessieovereenkomstjouw concessieovereenkomst
every concessieovereenkomstelke concessieovereenkomst
which concessieovereenkomst?welke concessieovereenkomst?
a big concessieovereenkomst / the big concessieovereenkomsteen grote concessieovereenkomst, de grote concessieovereenkomst