D. It argued that all people were subject to the rule of law.
Explanation:
The Magna Carta was a document issued in 1215. It established and codified many principled that still govern modern western constitutional thought.
The Magna Carta had a series of principles and liberties. It basically meant that the King could not rule in arbitrary and in an unpredictable way. The main principle meant everyone was subjected to the law, including the king.
