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 statement highlights Mao's need to reestablish his authority and ideological purity within the Communist Party following the disastrous outcomes of the Great Leap Forward, which significantly undermined his leadership and the party's credibility. The Cultural Revolution aimed to eliminate perceived threats and reassert Maoist principles among party members and the populace.