The disaster at Chernobyl was a nuclear accident in Ukraine in 1986.
The creation of sacred texts is very important to the spread of Hinduism because it basically provides a formal and written documentation or proof about the religion that can be used by the different civilizations and generations to come for research purposes.
I believe the answer is D. The way the workers were treated by big business and big industry.
In a short term: the Mongols would have have the control over the lands.
In a long tern: either the European powers would not have conquered the other continents during the colonial time, or if the Mongols had done the same, possibly in the Americas and Africa Mongolian would be spoken today.