It would be D.
Explanation:
Spain lost control over Cuba, Puerto Rico, Guam, and the Philippines which are oversea islands
Stalin unified the Soviet Union after the death of Lenin, although it should be noted that this "unification process" involved mass killings and deportations of people Stalin deemed to be enemies of the state.
According to the graph, and if the trend continues, in 2030, D. more than 80% will be living in urban settings.
