It is not true that after King Nzinga introduced Christianity that C. Royal and religious regalia figures were mostly made of terracotta.
After the Kongo Kingdom became Christian:
The Kongo Kingdom became immensely wealthy from trade and this was thanks to Christianity solidifying their trading activities with other nations.
In conclusion, the Kongo people did not make regalia from mostly terracotta.
Find out more about the benefits of trade at https://brainly.com/question/4957225.