What proposed changes in 1960 caused mao to launch a cultural revolution? check all that apply.
to allow workers to compete for wages
to introduce the concept of rural markets
to prosecute government officials
to permit farmers to sell excess crops
to form paramilitary groups of students
to encourage farmers to own private land

The correct answer is:

Mao Zedong was the Founding Father of the Peoples' Republic of China. Under his "Great Leap Forward Strategy", launched in 1958, Mao proposed a reform in the current agricultural system of the country. This led to the fusion of numerous small agricultural collectives into large people's communes, which were ordered to put into practice some unproven farming techniques. This led to an immediate reduction of the crop output in 1959, as the techniques were proven unsuccessful. Total grain production was reduced by 15% in 1959 and a further 10% in 1960. It would not recover until the beginning of 1962.

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation: