What Was the Purpose of the Magna Carta Signed by England's

What was the purpose of the Magna Carta signed by England's John the First in the 13 ^th century?

A) English monarchs accepted that their powers were limited and they too were bound to the laws.
B) The Magna Carta helped establish a more centralized English monarchy.
C) The Magna Carta led directly to the War of the Roses.
D) It contributed to the country's losses in the Hundred Years' War.
E) It finally placed some minimal restraints on the unruly nobles.