De or het rentedaling?

The correct Dutch article is:

de rentedaling

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

How to use rentedaling

the rentedalingde rentedaling
this rentedalingdeze rentedaling
that rentedalingdie rentedaling
our rentedalingonze rentedaling
your rentedalingjouw rentedaling
every rentedalingelke rentedaling
which rentedaling?welke rentedaling?
a big rentedaling / the big rentedalingeen grote rentedaling, de grote rentedaling