The major belief behind Marxism is that in industrialized nations, the working class (proletariat) will violently overthrow the bourgeois (the high classes) in order to equal out classes and establish a socialist society.
Out of all the answers, C is the most likely. Majority of our current forms of energy are nonrenewable resources. As such, we're using them all up.
Britain had to cross the Atlantic Ocean to get to the Colonies