The correct option is A Civil war between the barons and king broke out
Although King John agreed the terms of Magna Carta and the barons renewed their oaths of allegiance, the settlement did not last long. Aggrieved by the manner in which Magna Carta was to be enforced, John sent messengers to the Pope in the summer of 1215, requesting that the charter be annulled. In September 1215, civil war broke out between King John and his barons. The King raised an army of mercenaries to fight his cause, while the barons renounced their allegiance to him, and invited Prince Louis (1187–1226), son of the King of France, to accept the English crown. Louis invaded England in 1216, and England was still at war when John died of dysentery on the night of 18 October 1216. Hence, Option A is correct.