Final answer:
Jack leaves the group to start his own tribe in 'Lord of the Flies' after his demand to be chief is ignored and Ralph is elected instead, leading to a pivotal shift in the novel's dynamics. The correct answer is option C).
Step-by-step explanation:
When the boys in Lord of the Flies do not respond to Jack's demand to be chief, Jack leaves the group and starts his own tribe. Initially, he is humiliated and angry when the boys elect Ralph as chief, but he asserts his position by declaring that he is still in charge of the choirboys, who will be hunters. The situation escalates after Jack's growing resentment towards Ralph's leadership and the formation of rules. Eventually, this leads to Jack splintering from the main group to create a new tribe that follows his authoritarian style, which marks a pivotal moment in the breakdown of civilized order on the island.