The correct answer from my humble point of view is B. Improving educational opportunities. Since the diagtam shows three aspects that can contribute to growing the sate economy. Remember: Investing in education is investing in the future.
Although this is somewhat subjective, many would agree that the British were the most successful since they developed the colonies such as Virginia that had the highest GDP and export numbers.
Victor Hugo wrote Les Miserables.
They were trying to accomplish better working conditions and better pay for the field workers.