The best analysis of the reason why Mao Zedong implemented the Cultural Revolution is:
Mao implemented the Cultural Revolution to regain control of the Communist Party after the failures of the Great Leap Forward.
This response highlights the political motivations behind the Cultural Revolution, particularly Mao's desire to reassert his influence and eliminate opposition within the party following the disastrous outcomes of the Great Leap Forward, which had led to widespread famine and economic difficulties.