The correct answer to this open question is the following.
Although there are no options attached we can say the following.
Mao Zedong was able to enact major reforms like the Cultural Revolution and the Great Leap Forward so quickly because he was a dictator and had all the power to create laws and legislation in China. He was the one who instilled Communism in China and formed the People's Republic of China when he got to power. That is why he was able to enact major reforms such as the Cultural Revolution and the Great Leap Forward with no opposition at all.
Mao Zedong never thought that this Great Leap Forward would result in a major disaster and a big famine. The worst in the history of China. Mao's original idea had been to launch China into an industrial revolution to create factories and fabrics to modernize China. However, the result was the opposite.