Natural gas—31.8%
Petroleum (crude oil and natural gas plant liquids)—28.0%
Coal—17.8%
Renewable energy—12.7%
Nuclear electric power—9.6%
This is a little open for interpretation, but I would generally say that the best answer is that Josip Broz Tito was a very powerful leader, who kept the republics and the different groups together.
For example, we can see this from the fact that the first conflict happened in 1981: one year after his death ( a protest of Kosovans who demanded autonomy).
The answer to the question is C
The answer is B. Industrialization meant that countries could produce more weapons
