De or het merkvervalsing?

The correct Dutch article is:

de merkvervalsing

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

How to use merkvervalsing

the merkvervalsingde merkvervalsing
this merkvervalsingdeze merkvervalsing
that merkvervalsingdie merkvervalsing
our merkvervalsingonze merkvervalsing
your merkvervalsingjouw merkvervalsing
every merkvervalsingelke merkvervalsing
which merkvervalsing?welke merkvervalsing?
a big merkvervalsing / the big merkvervalsingeen grote merkvervalsing, de grote merkvervalsing