What was the chinese cultural revolution

The Cultural Revolution, formally the Great Proletarian Cultural Revolution, was a sociopolitical movement in the People's Republic of China from 1966 until 1976. ... Mao launched the movement in May 1966, soon calling on young people to "bombard the headquarters" and proclaiming that "to rebel is justified".

d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.