Why Was the English Civil War Distinct

Why was the English civil war distinct?

A) Religion was the sole cause of the conflict, which signaled a new type of civil war that would spread across the continent.
B) It was the only civil war at the time that caused the government to change fundamentally, with the monarchy temporarily replaced by a republic.
C) Fighting in the British Isles led to the largest death toll the country had ever seen, foreshadowing a new approach to warfare in Europe.
D) The king negotiated the final settlement, and the original form of government could be maintained.
E) The new system of government claimed its legitimacy based on the royal family rather than Parliament.