Prejudice against the Jewish people had been ingrained in European culture for centuries. The best definition for ingrained probably is a made a part of b written down c put into people's minds d put into law

The answer is C.

Explanation:

A is not correct because prejudice is not a part of European culture.

B is not correct because it is not referring to written documentary.

C is correct because through many horrid acts against Jewish people in Europe people belonging to other religions have been taught to think of Jews as less than themselves.

D is not correct because it is not law in Europe to have prejudice against Jewish people.