De or het apologetica?

The correct Dutch article is:

de apologetica

Rule Words ending in -ica: usually de. See the rule
Meaning (Dutch) (filosofie, religie) leer der verdediging (van het Christendom)

How to use apologetica

the apologeticade apologetica
this apologeticadeze apologetica
that apologeticadie apologetica
our apologeticaonze apologetica
your apologeticajouw apologetica
every apologeticaelke apologetica
which apologetica?welke apologetica?
a big apologetica / the big apologeticaeen grote apologetica, de grote apologetica

Meaning, plural, diminutive, pronunciation and translations: WikiWoordenboek (Dutch Wiktionary) (CC BY-SA 4.0). Example sentences: Tatoeba (CC BY 2.0 FR).