De or het recordverbetering?

The correct Dutch article is:

de recordverbetering

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

How to use recordverbetering

the recordverbeteringde recordverbetering
this recordverbeteringdeze recordverbetering
that recordverbeteringdie recordverbetering
our recordverbeteringonze recordverbetering
your recordverbeteringjouw recordverbetering
every recordverbeteringelke recordverbetering
which recordverbetering?welke recordverbetering?
a big recordverbetering / the big recordverbeteringeen grote recordverbetering, de grote recordverbetering