One of the Great Political Developments in England in the Thirteenth

One of the great political developments in England in the thirteenth century was

A) King John's success in bringing about a drastic reduction of the power of the nobility.
B) the emergence of the English Parliament under Edward I.
C) Edward I's successful unification of all the British Isles into a single feudal kingdom.
D) the written recognition that the English monarchy should have absolute power.
E) all of the above.