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 option accurately reflects Mao's motivations, as the Cultural Revolution was aimed at strengthening his leadership and ideology within the Communist Party and society, addressing the challenges and discontent arising from the failures of previous policies, particularly the Great Leap Forward.