Answer :
"The strong influence and flexibility of Communist ideology" best describes the cause of the cultural revolution lack of idealism.
The correct answer is: The strong influence and inflexibility of communist ideology.
The cultural revolution was a sociopolitical movement that happened in China from 1966 to 1976. It was initiated by Mao Zedong, his goal was to preserve Chinese communism but under the influence of the capitalist and traditional elements of Chinese society, in addition to imposing again the thought Maoist as an ideology within the Party as an escape of the strict communist ideology.