"Hulagu has sacked all the cities of the Muslims, and has brought about the death of the Caliph. With the help of Allah, I will call him to account for so much innocent blood." - Berke on in his letter to the great Khan of the Mongols

According to this quote what grievance did Burke Khan have with Hulagu Khan that contributed to the start of the Berke-Hulagu War?

A) Berke was upset because Hulagu did not share the spoils of his Muslim conquests with him
B) Berke, who had converted to Islam , was upset that Hulagu had launched a campaign against Muslim nations
C) Berke is complaining that Hulagu should have checked with him first prior to waging war within his portion of the empire
D) Berke did not feel that Hulagu was justified in his attacks against the Muslims as they were an important part of the Mongol community