De or het stijlverandering?

The correct Dutch article is:

de stijlverandering

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

How to use stijlverandering

the stijlveranderingde stijlverandering
this stijlveranderingdeze stijlverandering
that stijlveranderingdie stijlverandering
our stijlveranderingonze stijlverandering
your stijlveranderingjouw stijlverandering
every stijlveranderingelke stijlverandering
which stijlverandering?welke stijlverandering?
a big stijlverandering / the big stijlveranderingeen grote stijlverandering, de grote stijlverandering