The answer is letter B. I<span>n 1910, Japan annexed Korea.
Japan ruled over korea starting in 1910, right after Korea's Josean dynastic monarchy has ended. The rule ended after World War II ended at 1945.
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Two of the greatest problems that arose from Industrialization and urbanization were that 1) workers int he factories were working incredibly long hours in very dangerous positions, and 2) that there was overcrowding in cities, which led to the quick spread of disease and other public health issues.