Mao zedong launched the cultural revolution in china in response to

new economic policies that threatened social equality.
new democratic policies that threatened social equality.
new social policies that threatened economic equality.
new communist policies that threatened economic equality

Mao Zedong launched the Cultural Revolution in China in response to  new economic policies that threatened social equality.

Explanation:

The Cultural Revolution was a political campaign in the People's Republic of China, staged by Mao Zedong, then chairman of the Communist Party of China, with the support of a radical younger generation within and in the immediate vicinity of the party.  

The campaign began at a meeting of the Central Committee of the Communist Party in 1966, when Mao Zedong conducted a coup by allowing a large number of younger activists who were not rapporteurs of the Central Committee to attend the meeting. Mao Zedong officially announced the Cultural Revolution as ended in 1969, following a growing opposition in the country against it. However, according to the general view, the Cultural Revolution was only finally terminated in 1976.

The primary objective of the Cultural Revolution was to eradicate bourgeois thought throughout Chinese society and replace it with socialism. Previously, Chinese communism had been almost widespread in the state apparatus and means of production. Mao Zedong's main means of conducting this campaign was the Red Guard, a militia of young people, mainly from the big cities who traveled around by train throughout the country, and regularly held gigantic big meetings. An unofficial goal of the campaign was to strengthen Mao Zedong's power over China, but it definitely failed when his loyal, intended successor Lin Biao was first put under suspicion of coup attempt, and then mysteriously perished in a plane crash in 1971.