Final answer:
The nobility of the Robe in European history refers to noble individuals who served as judges in the royal courts, playing an important role in the legal system and governance of European countries. The correct answer is c).
Step-by-step explanation:
The nobility of the Robe in European history refers to c) Noble individuals who served as judges in the royal courts. The nobility of the Robe was a class of nobility that gained their status through their service as judges in the royal courts. They were known for their distinctive clothing, which distinguished them from the nobility of the Sword and the nobility of the Church. The nobility of the Robe played an important role in the legal system and governance of European countries.