Correct answer choice is:
B. The Great Leap Forward
Explanation:
The Great Leap Forward of the People's Republic of China held a financial and political campaign by a single Communist Party of China from 1958 to 1962.
The Great Leap Forward designed to advance cultivation and manufacturing. Mao considered that both had to develop to enable the other to produce. The production could just benefit if the workforce remained well supported, while the farming operators required industry to build the advanced tools required for modernization. To support for aforementioned, China was transformed into a group of municipalities.
Communism expanded. At the end of the war, North Vietnam conquered South Vietnam in 1975. The north and south united under one government. Communism spread and is one of the few remaining communist countries.
I think it is D because transportation helped people go to far away places, and manufacturing produces goods.