C. high unemployment is the answer...I think.
Generally speaking, one of the biggest problems facing India is "<span>b. rapid increases in population", since India is currently the largest democracy in the entire world and continues to grow with limited space.</span>
It would be primarily "The Church and the Crusades" that <span>played a significant role in uniting the kings and people of Europe, since adhering to religious principles back then was the norm for most. </span>
Britain and France, standing by their guarantee of Poland's<span>border, had declared war on Germany on September 3, 1939.</span>